* predict.c (determine_unlikely_bbs): Forward declare; also determine
	edges that are always known to be taken because it is only likely
	edge out of given BB.
	(tree_estimate_probability): Call before profile guessing to get bit
	of extra precision.

	* gcc.dg/predict-13.c: Update template.
	* gcc.dg/predict-13b.c: New testcase.
	* gcc.dg/predict-22.c: New testcase.
	* gcc.dg/tree-ssa/ipa-split-4.c: Change abort to other function to
	get sane profile.

From-SVN: r266587