Workaround following [PATCH] Pul all constants last in tree_swap_operands_p

https://gcc.gnu.org/ml/gcc-patches/2014-09/msg01509.html
gcc/:
        * fold-const.c (tree_swap_operands_p): Strip only sign-preserving NOPs.

From-SVN: r215465

gcc/ChangeLog

+2014-09-22  Alan Lawrence  <alan.lawrence@arm.com>
+
+	* fold-const.c (tree_swap_operands_p): Strip only sign-preserving NOPs.
+
 2014-09-22  Richard Biener  <rguenther@suse.de>
 
 	* gimplify.c (gimplify_init_constructor): Do not leave

gcc/fold-const.c

@@ -6647,8 +6647,8 @@ tree_swap_operands_p (const_tree arg0, const_tree arg1, bool reorder)
   if (CONSTANT_CLASS_P (arg0))
     return 1;
 
-  STRIP_NOPS (arg0);
-  STRIP_NOPS (arg1);
+  STRIP_SIGN_NOPS (arg0);
+  STRIP_SIGN_NOPS (arg1);
 
   if (TREE_CONSTANT (arg1))
     return 0;