Fix remove_predictions_associated_with_edge

Fix remove_predictions_associated_with_edge

remove_predictions_associated_with_edge currently calls filter_predicitons
passing it equal_edge_p. Becase filter_predictions removes all edges where
filter returns false, the function does exact oposite. Fixed thus.

Bootstrapped/regtested x86_64-linux.

gcc/ChangeLog:

2020-08-02  Jan Hubicka  <hubicka@ucw.cz>

	* predict.c (filter_predictions): Document semantics of filter.
	(equal_edge_p): Rename to ...
	(not_equal_edge_p): ... this; reverse semantics.
	(remove_predictions_associated_with_edge): Fix.