Fix optimize_mask_stores profile update

[Jan Hubicka <hubicka@ucw.cz>]

Hi,
While looking into sphinx3 regression I noticed that vectorizer produces
BBs with overall probability count 120%.  This patch fixes it.
Richi, I don't know how to create a testcase, but having one would
be nice.

Bootstrapped/regtested x86_64-linux, commited last night (sorry for
late email)

gcc/ChangeLog:

	PR tree-optimization/110649
	* tree-vect-loop.cc (optimize_mask_stores): Set correctly
	probability of the if-then-else construct.

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 7d917bfd72c..b44fb9c7712 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -11680,6 +11679,7 @@ optimize_mask_stores (class loop *loop)
       efalse = make_edge (bb, store_bb, EDGE_FALSE_VALUE);
       /* Put STORE_BB to likely part.  */
       efalse->probability = profile_probability::unlikely ();
+      e->probability = efalse->probability.invert ();
       store_bb->count = efalse->count ();
       make_single_succ_edge (store_bb, join_bb, EDGE_FALLTHRU);
       if (dom_info_available_p (CDI_DOMINATORS))