hppa: Add LRA support

LRA is not enabled as default since there are some new test fails
remaining to resolve.

2024-10-18  John David Anglin  <danglin@gcc.gnu.org>

gcc/ChangeLog:

	PR target/113933
	* config/pa/pa.cc (pa_use_lra_p): Declare.
	(TARGET_LRA_P): Change define to pa_use_lra_p.
	(pa_use_lra_p): New function.
	(legitimize_pic_address): Also check lra_in_progress.
	(pa_emit_move_sequence): Likewise.
	(pa_legitimate_constant_p): Likewise.
	(pa_legitimate_address_p): Likewise.
	(pa_secondary_reload): For floating-point loads and stores,
	return NO_REGS for REG and SUBREG operands.  Return
	GENERAL_REGS for some shift register spills.
	* config/pa/pa.opt: Add mlra option.
	* config/pa/predicates.md (integer_store_memory_operand):
	Also check lra_in_progress.
	(floating_point_store_memory_operand): Likewise.
	(reg_before_reload_operand): Likewise.