Revert: Workaround following [PATCH] Pul all constants last in tree_swap_operands_p

	https://gcc.gnu.org/ml/gcc-patches/2014-09/msg01509.html
	2014-09-22  Alan Lawrence  <alan.lawrence@arm.com>
	gcc/:
        	* fold-const.c (tree_swap_operands_p): Strip only sign-preserving NOPs.

From-SVN: r217927