RISC-V: Add scalar move support and fix VSETVL bugs

gcc/ChangeLog:

	* config/riscv/constraints.md (Wb1): New constraint.
	* config/riscv/predicates.md
	(vector_least_significant_set_mask_operand): New predicate.
	(vector_broadcast_mask_operand): Ditto.
	* config/riscv/riscv-protos.h (enum vlmul_type): Adjust.
	(gen_scalar_move_mask): New function.
	* config/riscv/riscv-v.cc (gen_scalar_move_mask): Ditto.
	* config/riscv/riscv-vector-builtins-bases.cc (class vmv): New class.
	(class vmv_s): Ditto.
	(BASE): Ditto.
	* config/riscv/riscv-vector-builtins-bases.h: Ditto.
	* config/riscv/riscv-vector-builtins-functions.def (vmv_x): Ditto.
	(vmv_s): Ditto.
	(vfmv_f): Ditto.
	(vfmv_s): Ditto.
	* config/riscv/riscv-vector-builtins-shapes.cc (struct scalar_move_def): Ditto.
	(SHAPE): Ditto.
	* config/riscv/riscv-vector-builtins-shapes.h: Ditto.
	* config/riscv/riscv-vector-builtins.cc (function_expander::mask_mode): Ditto.
	(function_expander::use_exact_insn): New function.
	(function_expander::use_contiguous_load_insn): New function.
	(function_expander::use_contiguous_store_insn): New function.
	(function_expander::use_ternop_insn): New function.
	(function_expander::use_widen_ternop_insn): New function.
	(function_expander::use_scalar_move_insn): New function.
	* config/riscv/riscv-vector-builtins.def (s): New operand suffix.
	* config/riscv/riscv-vector-builtins.h
	(function_expander::add_scalar_move_mask_operand): New class.
	* config/riscv/riscv-vsetvl.cc (ignore_vlmul_insn_p): New function.
	(scalar_move_insn_p): Ditto.
	(has_vsetvl_killed_avl_p): Ditto.
	(anticipatable_occurrence_p): Ditto.
	(insert_vsetvl): Ditto.
	(get_vl_vtype_info): Ditto.
	(calculate_sew): Ditto.
	(calculate_vlmul): Ditto.
	(incompatible_avl_p): Ditto.
	(different_sew_p): Ditto.
	(different_lmul_p): Ditto.
	(different_ratio_p): Ditto.
	(different_tail_policy_p): Ditto.
	(different_mask_policy_p): Ditto.
	(possible_zero_avl_p): Ditto.
	(first_ratio_invalid_for_second_sew_p): Ditto.
	(first_ratio_invalid_for_second_lmul_p): Ditto.
	(second_ratio_invalid_for_first_sew_p): Ditto.
	(second_ratio_invalid_for_first_lmul_p): Ditto.
	(second_sew_less_than_first_sew_p): Ditto.
	(first_sew_less_than_second_sew_p): Ditto.
	(compare_lmul): Ditto.
	(second_lmul_less_than_first_lmul_p): Ditto.
	(first_lmul_less_than_second_lmul_p): Ditto.
	(first_ratio_less_than_second_ratio_p): Ditto.
	(second_ratio_less_than_first_ratio_p): Ditto.
	(DEF_INCOMPATIBLE_COND): Ditto.
	(greatest_sew): Ditto.
	(first_sew): Ditto.
	(second_sew): Ditto.
	(first_vlmul): Ditto.
	(second_vlmul): Ditto.
	(first_ratio): Ditto.
	(second_ratio): Ditto.
	(vlmul_for_first_sew_second_ratio): Ditto.
	(ratio_for_second_sew_first_vlmul): Ditto.
	(DEF_SEW_LMUL_FUSE_RULE): Ditto.
	(always_unavailable): Ditto.
	(avl_unavailable_p): Ditto.
	(sew_unavailable_p): Ditto.
	(lmul_unavailable_p): Ditto.
	(ge_sew_unavailable_p): Ditto.
	(ge_sew_lmul_unavailable_p): Ditto.
	(ge_sew_ratio_unavailable_p): Ditto.
	(DEF_UNAVAILABLE_COND): Ditto.
	(same_sew_lmul_demand_p): Ditto.
	(propagate_avl_across_demands_p): Ditto.
	(reg_available_p): Ditto.
	(avl_info::has_non_zero_avl): Ditto.
	(vl_vtype_info::has_non_zero_avl): Ditto.
	(vector_insn_info::operator>=): Refactor.
	(vector_insn_info::parse_insn): Adjust for scalar move.
	(vector_insn_info::demand_vl_vtype): Remove.
	(vector_insn_info::compatible_p): New function.
	(vector_insn_info::compatible_avl_p): Ditto.
	(vector_insn_info::compatible_vtype_p): Ditto.
	(vector_insn_info::available_p): Ditto.
	(vector_insn_info::merge): Ditto.
	(vector_insn_info::fuse_avl): Ditto.
	(vector_insn_info::fuse_sew_lmul): Ditto.
	(vector_insn_info::fuse_tail_policy): Ditto.
	(vector_insn_info::fuse_mask_policy): Ditto.
	(vector_insn_info::dump): Ditto.
	(vector_infos_manager::release): Ditto.
	(pass_vsetvl::compute_local_backward_infos): Adjust for scalar move support.
	(pass_vsetvl::get_backward_fusion_type): Adjust for scalar move support.
	(pass_vsetvl::hard_empty_block_p): Ditto.
	(pass_vsetvl::backward_demand_fusion): Ditto.
	(pass_vsetvl::forward_demand_fusion): Ditto.
	(pass_vsetvl::refine_vsetvls): Ditto.
	(pass_vsetvl::cleanup_vsetvls): Ditto.
	(pass_vsetvl::commit_vsetvls): Ditto.
	(pass_vsetvl::propagate_avl): Ditto.
	* config/riscv/riscv-vsetvl.h (enum demand_status): New class.
	(struct demands_pair): Ditto.
	(struct demands_cond): Ditto.
	(struct demands_fuse_rule): Ditto.
	* config/riscv/vector-iterators.md: New iterator.
	* config/riscv/vector.md (@pred_broadcast<mode>): New pattern.
	(*pred_broadcast<mode>): Ditto.
	(*pred_broadcast<mode>_extended_scalar): Ditto.
	(@pred_extract_first<mode>): Ditto.
	(*pred_extract_first<mode>): Ditto.
	(@pred_extract_first_trunc<mode>): Ditto.
	* config/riscv/riscv-vsetvl.def: New file.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/vsetvl/vsetvlmax-10.c: Adjust test.
	* gcc.target/riscv/rvv/vsetvl/vsetvlmax-11.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vsetvlmax-12.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vsetvlmax-15.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vsetvlmax-18.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vsetvlmax-9.c: Ditto.