re PR middle-end/38074 (missed inlining on Core2 Duo due to apparent wrong branch...

re PR middle-end/38074 (missed inlining on Core2 Duo due  to apparent wrong branch prediction/profile)

	PR tree-optimization/38074
	* cgraphbuild.c (compute_call_stmt_bb_frequency): Fix handling of 0
	entry frequency.
	* predict.c (combine_predictions_for_bb): Ignore predictor predicting
	in both dirrection for first match heuristics.
	(tree_bb_level_predictions): Disable noreturn heuristic when there
	is no returning path.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
From-SVN: r142517