Fix an error in a CONST_INT_P patch from 2009.

	* simplify-rtx.c (simplify_unary_operation_1): Use CONST_INT_P in
	shift simplification where it was intended.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@210610 138bc75d-0d04-0410-961f-82ee72b054a4