re PR tree-optimization/80079 (Conditional jump or move depends on uninitialised…

re PR tree-optimization/80079 (Conditional jump or move depends on uninitialised value(s): gimple-ssa-store-merging.c:768)

	PR tree-optimization/80079
	* gimple-ssa-store-merging.c (class pass_store_merging): Initialize
	m_stores_head.

Co-Authored-By: Markus Trippelsdorf <markus@trippelsdorf.de>

From-SVN: r246224

gcc/ChangeLog

+2017-03-17  Marek Polacek  <polacek@redhat.com>
+	    Markus Trippelsdorf  <markus@trippelsdorf.de>
+
+	PR tree-optimization/80079
+	* gimple-ssa-store-merging.c (class pass_store_merging): Initialize
+	m_stores_head.
+
 2017-03-17  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/80075

gcc/gimple-ssa-store-merging.c

@@ -725,7 +725,7 @@ class pass_store_merging : public gimple_opt_pass
 {
 public:
   pass_store_merging (gcc::context *ctxt)
-    : gimple_opt_pass (pass_data_tree_store_merging, ctxt)
+    : gimple_opt_pass (pass_data_tree_store_merging, ctxt), m_stores_head ()
   {
   }