re PR tree-optimization/79389 (30% performance regression in SciMark2 MonteCarlo)

re PR tree-optimization/79389 (30% performance regression in SciMark2 MonteCarlo)

	PR tree-optimization/79389
	* ifcvt.c (struct noce_if_info): Add rev_cond field.
	(noce_reversed_cond_code): New function.
	(noce_emit_store_flag): Use rev_cond if non-NULL instead of
	reversed_comparison_code.  Formatting fix.
	(noce_try_store_flag): Test rev_cond != NULL in addition to
	reversed_comparison_code.
	(noce_try_store_flag_constants): Likewise.
	(noce_try_store_flag_mask): Likewise.
	(noce_try_addcc): Use rev_cond if non-NULL instead of
	reversed_comparison_code.
	(noce_try_cmove_arith): Likewise.  Formatting fixes.
	(noce_try_minmax, noce_try_abs): Clear rev_cond.
	(noce_find_if_block): Initialize rev_cond.
	(find_cond_trap): Call noce_get_condition with then_bb == trap_bb
	instead of false as last argument never attempt to reverse it
	afterwards.

From-SVN: r245690