* doc/invoke.texi (hot-bb-count-fraction): Rework description.
	(hot-bb-count-ws-permille): Likewise.
	(hot-bb-frequency-fraction): Likewise.
	(unlikely-bb-count-fraction): Likewise.
	* params.def (hot-bb-count-fraction): Rework description.
	(hot-bb-count-ws-permille): Likewise.
	(hot-bb-frequency-fraction): Likewise.
	(unlikely-bb-count-fraction): Likewise.  Remove min and max values.
	* predict.c (get_hot_bb_threshold): Deal with 0 HOT_BB_COUNT_FRACTION.

From-SVN: r274006