Fix Bug savannah/1825:

	Fix Bug savannah/1825:
	* config/tc-m68hc11.h (md_relax_frag): Define to support relaxations
	that are not pc-relative.
	(m68hc11_relax_frag): Declare.

	* config/tc-m68hc11.c (build_indexed_byte): Use a frag_var to handle
	the offsetable indexed addressing modes (n,r).
	(build_insn): Cleanup some locals.
	(m68hc11_relax_frag): New function imported from tc-cris.c to handle
	relaxation of difference between two symbols of same section.
	(md_convert_frag): For INDEXED_OFFSET relaxs, use the displacement
	only when this is a PC-relative operand and the offset is not absolute.
	(md_estimate_size_before_relax): Convert the INDEXED_OFFSET,UNDEF frag
	to INDEXED_OFFSET,STATE_BITS5 when the symbol is absolute; this will
	be handled by m68hc11_relax_frag.