* predict.c (maybe_hot_bb_p): Do not check profile status.
	(maybe_hot_edge_p): Likewise.
	(probably_never_executed): Check for zero counts even if profile
	is not read.
	(unlikely_executed_edge_p): New function.
	(unlikely_executed_stmt_p): New function.
	(unlikely_executed_bb_p): New function.
	(set_even_probabilities): Use unlikely predicates.
	(combine_predictions_for_bb): Likewise.
	(predict_paths_for_bb): Likewise.
	(predict_paths_leading_to_edge): Likewise.
	(determine_unlikely_bbs): New function.
	(estimate_bb_frequencies): Use it.
	(compute_function_frequency): Use zero counts even if profile is
	not read.
	* profile-count.h: Fix typo.

	* g++.dg/tree-ssa/counts-1.C: New testcase.
	* gcc.dg/tree-ssa/counts-1.c: New testcase.

From-SVN: r249013