Fix ASAN bootstrap (uninitialized variable warning)

	* tree-vect-patterns.c (vect_recog_mask_conversion_pattern):
	Initialize a variable with default value.

From-SVN: r236203

gcc/ChangeLog

 2016-05-13  Martin Liska  <mliska@suse.cz>
 
+	* tree-vect-patterns.c (vect_recog_mask_conversion_pattern):
+	Initialize a variable with default value.
+
+2016-05-13  Martin Liska  <mliska@suse.cz>
+
 	* doc/invoke.texi: Enhance explanation of error recovery
 	of sanitizers.
 

gcc/tree-vect-patterns.c

@@ -3570,7 +3570,8 @@ vect_recog_mask_conversion_pattern (vec<gimple *> *stmts, tree *type_in,
 {
   gimple *last_stmt = stmts->pop ();
   enum tree_code rhs_code;
-  tree lhs, rhs1, rhs2, tmp, rhs1_type, rhs2_type, vectype1, vectype2;
+  tree lhs = NULL_TREE, rhs1, rhs2, tmp, rhs1_type, rhs2_type;
+  tree vectype1, vectype2;
   stmt_vec_info stmt_vinfo = vinfo_for_stmt (last_stmt);
   stmt_vec_info pattern_stmt_info;
   vec_info *vinfo = stmt_vinfo->vinfo;