RISC-V: Refactor and cleanup vsetvl pass

This patch refactors and cleanups the vsetvl pass in order to make the code
easier to modify and understand. This patch does several things:

1. Introducing a virtual CFG for vsetvl infos and Phase 1, 2 and 3 only maintain
   and modify this virtual CFG. Phase 4 performs insertion, modification and
   deletion of vsetvl insns based on the virtual CFG. The basic block in the
   virtual CFG is called vsetvl_block_info and the vsetvl information inside
   is called vsetvl_info.
2. Combine Phase 1 and 2 into a single Phase 1 and unified the demand system,
   this phase only fuse local vsetvl info in forward direction.
3. Refactor Phase 3, change the logic for determining whether to uplift vsetvl
   info to a pred basic block to a more unified method that there is a vsetvl
   info in the vsetvl defintion reaching in compatible with it.
4. Place all modification operations to the RTL in Phase 4 and Phase 5.
   Phase 4 is responsible for inserting, modifying and deleting vsetvl
   instructions based on fully optimized vsetvl infos. Phase 5 removes the avl
   operand from the RVV instruction and removes the unused dest operand
   register from the vsetvl insns.

These modifications resulted in some testcases needing to be updated. The reasons
for updating are summarized below:

1. more optimized
   vlmax_back_prop-{25,26}.c
   vlmax_conflict-{3,12}.c/vsetvl-{13,23}.c/vsetvl-23.c/
   avl_single-{23,84,95}.c/pr109773-1.c
2. less unnecessary fusion
   avl_single-46.c/imm_bb_prop-1.c/pr109743-2.c/vsetvl-18.c
3. local fuse direction (backward -> forward)
   scalar_move-1.c
4. add some bugfix testcases.
   pr111037-{3,4}.c/pr111037-4.c
   avl_single-{89,104,105,106,107,108,109}.c

	PR target/111037
	PR target/111234
	PR target/111725

gcc/ChangeLog:

	* config/riscv/riscv-vsetvl.cc (bitmap_union_of_preds_with_entry): New.
	(debug): Removed.
	(compute_reaching_defintion): New.
	(enum vsetvl_type): Moved.
	(vlmax_avl_p): Moved.
	(enum emit_type): Moved.
	(vlmul_to_str): Moved.
	(vlmax_avl_insn_p): Removed.
	(policy_to_str): Moved.
	(loop_basic_block_p): Removed.
	(valid_sew_p): Removed.
	(vsetvl_insn_p): Moved.
	(vsetvl_vtype_change_only_p): Removed.
	(after_or_same_p): Removed.
	(before_p): Removed.
	(anticipatable_occurrence_p): Removed.
	(available_occurrence_p): Removed.
	(insn_should_be_added_p): Removed.
	(get_all_sets): Moved.
	(get_same_bb_set): Moved.
	(gen_vsetvl_pat): Removed.
	(calculate_vlmul): Moved.
	(get_max_int_sew): New.
	(emit_vsetvl_insn): Removed.
	(get_max_float_sew): New.
	(eliminate_insn): Removed.
	(insert_vsetvl): Removed.
	(count_regno_occurrences): Moved.
	(get_vl_vtype_info): Removed.
	(enum def_type): Moved.
	(validate_change_or_fail): Moved.
	(change_insn): Removed.
	(get_all_real_uses): Moved.
	(get_forward_read_vl_insn): Removed.
	(get_backward_fault_first_load_insn): Removed.
	(change_vsetvl_insn): Removed.
	(avl_source_has_vsetvl_p): Removed.
	(source_equal_p): Moved.
	(calculate_sew): Removed.
	(same_equiv_note_p): Moved.
	(get_expr_id): New.
	(incompatible_avl_p): Removed.
	(get_regno): New.
	(different_sew_p): Removed.
	(get_bb_index): New.
	(different_lmul_p): Removed.
	(has_no_uses): Moved.
	(different_ratio_p): Removed.
	(different_tail_policy_p): Removed.
	(different_mask_policy_p): Removed.
	(possible_zero_avl_p): Removed.
	(enum demand_flags): New.
	(second_ratio_invalid_for_first_sew_p): Removed.
	(second_ratio_invalid_for_first_lmul_p): Removed.
	(enum class): New.
	(float_insn_valid_sew_p): Removed.
	(second_sew_less_than_first_sew_p): Removed.
	(first_sew_less_than_second_sew_p): Removed.
	(class vsetvl_info): New.
	(compare_lmul): Removed.
	(second_lmul_less_than_first_lmul_p): Removed.
	(second_ratio_less_than_first_ratio_p): Removed.
	(DEF_INCOMPATIBLE_COND): Removed.
	(greatest_sew): Removed.
	(first_sew): Removed.
	(second_sew): Removed.
	(first_vlmul): Removed.
	(second_vlmul): Removed.
	(first_ratio): Removed.
	(second_ratio): Removed.
	(vlmul_for_first_sew_second_ratio): Removed.
	(vlmul_for_greatest_sew_second_ratio): Removed.
	(ratio_for_second_sew_first_vlmul): Removed.
	(class vsetvl_block_info): New.
	(DEF_SEW_LMUL_FUSE_RULE): New.
	(always_unavailable): Removed.
	(avl_unavailable_p): Removed.
	(class demand_system): New.
	(sew_unavailable_p): Removed.
	(lmul_unavailable_p): Removed.
	(ge_sew_unavailable_p): Removed.
	(ge_sew_lmul_unavailable_p): Removed.
	(ge_sew_ratio_unavailable_p): Removed.
	(DEF_UNAVAILABLE_COND): Removed.
	(same_sew_lmul_demand_p): Removed.
	(propagate_avl_across_demands_p): Removed.
	(reg_available_p): Removed.
	(support_relaxed_compatible_p): Removed.
	(demands_can_be_fused_p): Removed.
	(earliest_pred_can_be_fused_p): Removed.
	(vsetvl_dominated_by_p): Removed.
	(avl_info::avl_info): Removed.
	(avl_info::single_source_equal_p): Removed.
	(avl_info::multiple_source_equal_p): Removed.
	(DEF_SEW_LMUL_RULE): New.
	(avl_info::operator=): Removed.
	(avl_info::operator==): Removed.
	(DEF_POLICY_RULE): New.
	(avl_info::operator!=): Removed.
	(avl_info::has_non_zero_avl): Removed.
	(vl_vtype_info::vl_vtype_info): Removed.
	(vl_vtype_info::operator==): Removed.
	(DEF_AVL_RULE): New.
	(vl_vtype_info::operator!=): Removed.
	(vl_vtype_info::same_avl_p): Removed.
	(vl_vtype_info::same_vtype_p): Removed.
	(vl_vtype_info::same_vlmax_p): Removed.
	(vector_insn_info::operator>=): Removed.
	(vector_insn_info::operator==): Removed.
	(class pre_vsetvl): New.
	(vector_insn_info::parse_insn): Removed.
	(vector_insn_info::compatible_p): Removed.
	(vector_insn_info::skip_avl_compatible_p): Removed.
	(vector_insn_info::compatible_avl_p): Removed.
	(vector_insn_info::compatible_vtype_p): Removed.
	(vector_insn_info::available_p): Removed.
	(vector_insn_info::fuse_avl): Removed.
	(vector_insn_info::fuse_sew_lmul): Removed.
	(vector_insn_info::fuse_tail_policy): Removed.
	(vector_insn_info::fuse_mask_policy): Removed.
	(vector_insn_info::local_merge): Removed.
	(vector_insn_info::global_merge): Removed.
	(vector_insn_info::get_avl_or_vl_reg): Removed.
	(vector_insn_info::update_fault_first_load_avl): Removed.
	(vector_insn_info::dump): Removed.
	(vector_infos_manager::vector_infos_manager): Removed.
	(vector_infos_manager::create_expr): Removed.
	(vector_infos_manager::get_expr_id): Removed.
	(vector_infos_manager::all_same_ratio_p): Removed.
	(vector_infos_manager::all_avail_in_compatible_p): Removed.
	(vector_infos_manager::all_same_avl_p): Removed.
	(vector_infos_manager::expr_set_num): Removed.
	(vector_infos_manager::release): Removed.
	(vector_infos_manager::create_bitmap_vectors): Removed.
	(vector_infos_manager::free_bitmap_vectors): Removed.
	(vector_infos_manager::dump): Removed.
	(class pass_vsetvl): Adjust.
	(pass_vsetvl::get_vector_info): Removed.
	(pass_vsetvl::get_block_info): Removed.
	(pass_vsetvl::update_vector_info): Removed.
	(pass_vsetvl::update_block_info): Removed.
	(pre_vsetvl::compute_avl_def_data): New.
	(pass_vsetvl::simple_vsetvl): Removed.
	(pass_vsetvl::compute_local_backward_infos): Removed.
	(pass_vsetvl::need_vsetvl): Removed.
	(pass_vsetvl::transfer_before): Removed.
	(pass_vsetvl::transfer_after): Removed.
	(pre_vsetvl::compute_vsetvl_def_data): New.
	(pass_vsetvl::emit_local_forward_vsetvls): Removed.
	(pass_vsetvl::prune_expressions): Removed.
	(pass_vsetvl::compute_local_properties): Removed.
	(pre_vsetvl::compute_lcm_local_properties): New.
	(pass_vsetvl::earliest_fusion): Removed.
	(pre_vsetvl::fuse_local_vsetvl_info): New.
	(pass_vsetvl::vsetvl_fusion): Removed.
	(pass_vsetvl::can_refine_vsetvl_p): Removed.
	(pre_vsetvl::earliest_fuse_vsetvl_info): New.
	(pass_vsetvl::refine_vsetvls): Removed.
	(pass_vsetvl::cleanup_vsetvls): Removed.
	(pass_vsetvl::commit_vsetvls): Removed.
	(pass_vsetvl::pre_vsetvl): Removed.
	(pass_vsetvl::get_vsetvl_at_end): Removed.
	(local_avl_compatible_p): Removed.
	(pass_vsetvl::local_eliminate_vsetvl_insn): Removed.
	(pre_vsetvl::pre_global_vsetvl_info): New.
	(get_first_vsetvl_before_rvv_insns): Removed.
	(pass_vsetvl::global_eliminate_vsetvl_insn): Removed.
	(pre_vsetvl::emit_vsetvl): New.
	(pass_vsetvl::ssa_post_optimization): Removed.
	(pre_vsetvl::cleaup): New.
	(pre_vsetvl::remove_avl_operand): New.
	(pass_vsetvl::df_post_optimization): Removed.
	(pre_vsetvl::remove_unused_dest_operand): New.
	(pass_vsetvl::init): Removed.
	(pass_vsetvl::done): Removed.
	(pass_vsetvl::compute_probabilities): Removed.
	(pass_vsetvl::lazy_vsetvl): Adjust.
	(pass_vsetvl::execute): Adjust.
	* config/riscv/riscv-vsetvl.def (DEF_INCOMPATIBLE_COND): Removed.
	(DEF_SEW_LMUL_RULE): New.
	(DEF_SEW_LMUL_FUSE_RULE): Removed.
	(DEF_POLICY_RULE): New.
	(DEF_UNAVAILABLE_COND): Removed
	(DEF_AVL_RULE): New demand type.
	(sew_lmul): New demand type.
	(ratio_only): New demand type.
	(sew_only): New demand type.
	(ge_sew): New demand type.
	(ratio_and_ge_sew): New demand type.
	(tail_mask_policy): New demand type.
	(tail_policy_only): New demand type.
	(mask_policy_only): New demand type.
	(ignore_policy): New demand type.
	(avl): New demand type.
	(non_zero_avl): New demand type.
	(ignore_avl): New demand type.
	* config/riscv/t-riscv: Removed riscv-vsetvl.h
	* config/riscv/riscv-vsetvl.h: Removed.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/scalar_move-1.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/avl_single-23.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/avl_single-46.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/avl_single-84.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/avl_single-89.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/avl_single-95.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/imm_bb_prop-1.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/pr109743-2.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/pr109773-1.c: Adjust.
	* gcc.target/riscv/rvv/base/pr111037-1.c: Moved to...
	* gcc.target/riscv/rvv/vsetvl/pr111037-1.c: ...here.
	* gcc.target/riscv/rvv/base/pr111037-2.c: Moved to...
	* gcc.target/riscv/rvv/vsetvl/pr111037-2.c: ...here.
	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-25.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-26.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/vlmax_conflict-12.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/vlmax_conflict-3.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/vsetvl-13.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/vsetvl-18.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/vsetvl-23.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/avl_single-104.c: New test.
	* gcc.target/riscv/rvv/vsetvl/avl_single-105.c: New test.
	* gcc.target/riscv/rvv/vsetvl/avl_single-106.c: New test.
	* gcc.target/riscv/rvv/vsetvl/avl_single-107.c: New test.
	* gcc.target/riscv/rvv/vsetvl/avl_single-108.c: New test.
	* gcc.target/riscv/rvv/vsetvl/avl_single-109.c: New test.
	* gcc.target/riscv/rvv/vsetvl/pr111037-3.c: New test.
	* gcc.target/riscv/rvv/vsetvl/pr111037-4.c: New test.