Update profile in optimize_mask_stores

[Jan Hubicka]

Hi,
this patch fixes profile update in optimize_mask_stores.
        * tree-vect-loop.c (optimize_mask_stores): Use make_single_succ_edge
        to update profile.

Index: tree-vect-loop.c
===================================================================
--- tree-vect-loop.c    (revision 249866)
+++ tree-vect-loop.c    (working copy)
@@ -7668,7 +7668,7 @@ optimize_mask_stores (struct loop *loop)
       /* Put STORE_BB to likely part.  */
       efalse->probability = profile_probability::unlikely ();
       store_bb->frequency = PROB_ALWAYS - EDGE_FREQUENCY (efalse);
-      make_edge (store_bb, join_bb, EDGE_FALLTHRU);
+      make_single_succ_edge (store_bb, join_bb, EDGE_FALLTHRU);
       if (dom_info_available_p (CDI_DOMINATORS))
        set_immediate_dominator (CDI_DOMINATORS, store_bb, bb);
       if (dump_enabled_p ())