Use range_compatible_p in check_operands_p.

Use range_compatible_p in check_operands_p.

Instead of directly checking type precision, check_operands_p should
invoke range_compatible_p to keep the range checking centralized.

	* gimple-range-fold.h (range_compatible_p): Relocate.
	* value-range.h (range_compatible_p): Here.
	* range-op-mixed.h (operand_equal::operand_check_p): Call
	range_compatible_p rather than comparing precision.
	(operand_not_equal::operand_check_p): Ditto.
	(operand_not_lt::operand_check_p): Ditto.
	(operand_not_le::operand_check_p): Ditto.
	(operand_not_gt::operand_check_p): Ditto.
	(operand_not_ge::operand_check_p): Ditto.
	(operand_plus::operand_check_p): Ditto.
	(operand_abs::operand_check_p): Ditto.
	(operand_minus::operand_check_p): Ditto.
	(operand_negate::operand_check_p): Ditto.
	(operand_mult::operand_check_p): Ditto.
	(operand_bitwise_not::operand_check_p): Ditto.
	(operand_bitwise_xor::operand_check_p): Ditto.
	(operand_bitwise_and::operand_check_p): Ditto.
	(operand_bitwise_or::operand_check_p): Ditto.
	(operand_min::operand_check_p): Ditto.
	(operand_max::operand_check_p): Ditto.
	* range-op.cc (operand_lshift::operand_check_p): Ditto.
	(operand_rshift::operand_check_p): Ditto.
	(operand_logical_and::operand_check_p): Ditto.
	(operand_logical_or::operand_check_p): Ditto.
	(operand_logical_not::operand_check_p): Ditto.