PR middle-end/81290
	* predict.c (force_edge_cold): Be more careful about propagation
	backward.
	* profile-count.h (profile_probability::guessed,
	profile_probability::fdo, profile_count::guessed, profile_count::fdo):
	New.
	* tree-ssa-threadupdate.c (recompute_probabilities): Result is guessed.

	* gcc.c-torture/compile/pr81290.c: New.

From-SVN: r249924