* tree-vrp.c (simplify_internal_call_using_ranges): If only
	one range is range_int_cst_p, but not both, at least optimize
	addition/subtraction of 0 and multiplication by 0 or 1.
	* gimple-fold.c (gimple_fold_call): Fold
	IFN_UBSAN_CHECK_{ADD,SUB,MUL}.
	(gimple_fold_stmt_to_constant_1): If both op0 and op1 aren't
	INTEGER_CSTs, try to fold at least x * 0 and y - y.

From-SVN: r208840