aarch64: Make use of RTL predicates

2020-11-10  Andrea Corallo  <andrea.corallo@arm.com>

	* config/aarch64/aarch64.c (tls_symbolic_operand_type)
	(aarch64_load_symref_appropriately, aarch64_mov128_immediate)
	(aarch64_expand_mov_immediate)
	(aarch64_maybe_expand_sve_subreg_move)
	(aarch64_tls_referenced_p, aarch64_cannot_force_const_mem)
	(aarch64_base_register_rtx_p, aarch64_classify_index)
	(aarch64_classify_address, aarch64_symbolic_address_p)
	(aarch64_reinterpret_float_as_int, aarch64_float_const_rtx_p)
	(aarch64_can_const_movi_rtx_p, aarch64_select_cc_mode)
	(aarch64_print_operand, aarch64_label_mentioned_p)
	(aarch64_secondary_reload, aarch64_preferred_reload_class)
	(aarch64_address_cost, aarch64_tls_symbol_p)
	(aarch64_classify_symbol, aarch64_legitimate_pic_operand_p)
	(aarch64_legitimate_constant_p)
	(aarch64_sve_float_arith_immediate_p)
	(aarch64_sve_float_mul_immediate_p, aarch64_mov_operand_p)
	(fusion_load_store): Use RTL operands where possible.