* config/tc-h8300.c (h8300sxnmode): Add prototype.

	* config/tc-h8300.c (h8300sxnmode): Add prototype.
	(DSYMMODE): Remove.
	(parse_exp): Replace expressionS argument with a h8_op.  Parse the
	operand size as well.
	(skip_colonthing): Remove unused expression argument.  Tighten checks
	for 2-digit sizes.
	(colonmod24): Remove.
	(get_mova_operands): Combine calls to parse_exp and skip_colonthing.
	(get_operand): Likewise.  Use the standard code to read the size of
	pc-relative operands.
	(fix_operand_size): Include the size-guessing logic that used to be
	in colonmod24 and get_operand.  Don't apply dd:2 optimizations to
	offsets with a symbolic component.

testsuite/
	* gas/h8300/h8sx_disp2.[sd]: Add tests for symbolic displacements.