simplify-rtx.c (simplify_unary_operation_1): Use simplify_gen_binary for (not (neg ...)) and (neg (not ...)) cases.

gcc/
	* simplify-rtx.c (simplify_unary_operation_1): Use simplify_gen_binary
	for (not (neg ...)) and (neg (not ...)) cases.

From-SVN: r202506