[PR117248][LRA]: Rewriting reg notes update and fix calculation of conflict hard...

[PR117248][LRA]: Rewriting reg notes update and fix calculation of conflict hard regs of pseudo.

  LRA updates conflict hard regs of pseudo when some hard reg dies.  A
complicated PA div/mod insns reference for clobbered explicit hard regs and
hard reg as operands.  It prevents some hard reg dying although they
still conflict with pseudos living through.  Although on such insns LRA
updates wrongly reg notes (REG_DEAD, REG_UNUSED) which are used later in
rematerialization subpass.  The patch fixes the problems.

gcc/ChangeLog:

	PR rtl-optimization/117248
	* lra-lives.cc (start_living, start_dying): Remove.
	(insn_regnos, out_insn_regnos, insn_regnos_live_after): New.
	(sparseset_contains_pseudos_p): Remove.
	(make_hard_regno_live, make_hard_regno_dead): Return true if
	something in liveness is changed.
	(mark_pseudo_live,  mark_pseudo_dead): Ditto.
	(mark_regno_live, mark_regno_dead): Ditto.
	(clear_sparseset_regnos, regnos_in_sparseset_p): Use set instead
	of dead_set.
	(process_bb_lives): Rewrite dealing with reg notes.  Update
	conflict hard regs even when clobber hard reg is not marked as
	dead.
	(lra_create_live_ranges_1): Add initialization/finalization of
	insn_regnos, out_insn_regnos, insn_regnos_live_after.