* config/tc-mips.c (macro): Pass NULL for expression argument to

	* config/tc-mips.c (macro): Pass NULL for expression argument to
	macro_build for nori case.
	(SWITCH_TABLE): Define.
	(mips_force_relocation): Force a relocation for a switch table
	entry.
	(md_apply_fix): Write switch table entry value into file.
	(tc_gen_reloc): Use BFD_RELOC_GPREL32 for a switch table entry,
	and set the addend to the difference between the reloc address and
	the subtrahend.