* config/tc-sh.c (sh_relax): Rename from relax, and make global.

	* config/tc-sh.c (sh_relax): Rename from relax, and make global.
	Renamed all uses.
	(insert): Pass a size of 2, not 4.
	(build_relax): Remove unused len variable.
	(md_show_usage): Mention -little option.
	(md_convert_frag): Add segT argument.  Rewrite to generate relocs
	rather than to generate complete instructions here.
	(md_apply_fix): Adjust and clarify R_SH_PCRELIMM8BY4 case for
	changes in insert and md_pcrel_from.  Add cases for R_SH_PCDISP
	and R_SH_PCDISP8BY2.
	(md_pcrel_from): Don't subtract 1, add 2.
	(tc_coff_fix2rtype): Remove.
	(sh_coff_reloc_mangle): New function.
	* config/tc-sh.h (TC_COFF_FIX2RTYPE): Just return fx_r_type.
	(sh_relax): Declare.
	(TC_COUNT_RELOC): If relaxing, count PC relative relocs.
	(TC_RELOC_MANGLE): Define.
	(sh_coff_reloc_mangle): Declare.
	(tc_coff_sizemachdep): Declare.
	* tc.h (md_convert_frag): Add segT parameter to non BFD_ASSEMBLER
	declaration.
	* write.c (cvt_frag_to_fill): Add sec argument to non
	BFD_ASSEMBLER version.  Pass it to md_convert_frag.
	(write_object_file): Pass SEG_TEXT to cvs_frag_to_fill.
	* config/obj-coff.c (do_relocs_for): Pass segment info to
	TC_RELOC_MANGLE.
	(fixup_mdeps): Pass segment type to md_convert_frag.
	* config/tc-a29k.c (md_convert_frag): Add segT argument.
	* config/tc-h8300.c (md_convert_frag): Likewise.
	* config/tc-h8500.c (md_convert_frag): Likewise.
	* config/tc-i386.c (md_convert_frag): Likewise.
	* config/tc-i860.c (md_convert_frag): Likewise.
	* config/tc-i960.c (md_convert_frag): Likewise.
	* config/tc-m68k.c (md_convert_frag): Likewise.
	* config/tc-m88k.h (md_convert_frag): Likewise.
	* config/tc-ns32k.c (md_convert_frag): Likewise.
	* config/tc-rce.c (md_convert_frag): Likewise.
	* config/tc-tahoe.c (md_convert_frag): Likewise.
	* config/tc-vax.c (md_convert_frag): Likewise.
	* config/tc-w65.c (md_convert_frag): Likewise.
	* config/tc-z8k.c (md_convert_frag): Likewise.
	* config/tc-h8300.h (TC_RELOC_MANGLE): Add segment argument.
	* config/tc-h8500.h (TC_RELOC_MANGLE): Likewise.
	* config/tc-rce.h (TC_RELOC_MANGLE): Likewise.
	* config/tc-w65.h (TC_RELOC_MANGLE): Likewise.
	* config/tc-z8k.h (TC_RELOC_MANGLE): Likewise.