* coff-sh.c (sh_coff_howtos): Mark R_SH_PCDISP8BY2 and R_SH_PCDISP

	* coff-sh.c (sh_coff_howtos): Mark R_SH_PCDISP8BY2 and R_SH_PCDISP
	as PC relative.  Describe R_SH_IMM16.  Add entries for
	R_SH_SWITCH16, R_SH_SWITCH32, R_SH_USES, R_SH_COUNT, and
	R_SH_ALIGN.
	(SWAP_IN_RELOC_OFFSET): Define.
	(SWAP_OUT_RELOC_OFFSET): Define.
	(CALC_ADDEND): Define.
	(sh_reloc): Change sym_value and addr to type bfd_vma.  Skip reloc
	types other than R_SH_IMM32 and R_SH_PCDISP on an external symbol.
	(coff_bfd_relax_section): Define.
	(coff_bfd_get_relocated_section_contents): Define.
	(sh_relax_section): New static function.
	(sh_relax_delete_bytes): New static function.
	(sh_relocate_section): Handle R_SH_PCDISP on an external symbol.
	(sh_coff_get_relocated_section_contents): New static function.