* cppexp.c (possible_sum_sign, integer_overflow, left_shift,
	right_shift): Remove.
	(cpp_num, cpp_num_part, PART_PRECISION, HALF_MASK, LOW_PART,
	HIGH_PART): New.
	(struct op): Use cpp_num.
	(num_zerop, num_eq, num_positive, num_greater_freq, num_trim,
	num_part_mul, num_unary_op, num_binary_op, num_negate,
	num_bitwise_op, num_inequality_op, num_equality_op, num_mul,
	num_div_op, num_lshift, num_rshift, append_digit): New.
	(interpret_number, parse_defined, eval_token, reduce): Update
	for two-integer arithmetic.
	(binary_handler): New typedef.
	(optab): Update.
	(COMPARE, EQUALITY, BITWISE, MINMAX, UNARY, SHIFT): Delete.
	(_cpp_parse_expr, reduce): Update to handle two-integers.
	* cpplib.c (_cpp_test_assertion): Back up on CPP_EOF.
testsuite:
	* gcc.dg/cpp/arith-1.c: New semantic tests.
	* gcc.dg/cpp/if-1.c: Update.

From-SVN: r53900