Fix cygwin performance loss on linpack.

gcc/
	* tree-vect-data-refs.c (compare_tree): Call STRIP_NOPS.

From-SVN: r230667

gcc/ChangeLog

+2015-11-20  Jim Wilson  <jim.wilson@linaro.org>
+
+	* tree-vect-data-refs.c (compare_tree): Call STRIP_NOPS.
+
 2015-11-20  Evandro Menezes  <e.menezes@samsung.com>
 
 	* config/aarch64/aarch64.md (predicated): Copy attribute from

gcc/tree-vect-data-refs.c

@@ -2545,6 +2545,8 @@ compare_tree (tree t1, tree t2)
   if (t2 == NULL)
     return 1;
 
+  STRIP_NOPS (t1);
+  STRIP_NOPS (t2);
 
   if (TREE_CODE (t1) != TREE_CODE (t2))
     return TREE_CODE (t1) < TREE_CODE (t2) ? -1 : 1;