* predict.c (struct block_info_def): Remove nvisited.

	(propagate_freq): Use EDGE_DFS_BACK to detect irreducible regions.
	(estimate_bb_frequencies): Call mark_dfs_back_edges.

	* i386.c (ix86_agi_depdendant): Lea causes AGI only on the Pentium
	(ix86_adjust_cost): Teach scheduler that latency to load operand can
	be masked.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@44921 138bc75d-0d04-0410-961f-82ee72b054a4