gas/

	* config/tc-mips.c (imm_expr, imm2_expr, offset_expr): Tweak commentary.
	(imm_reloc): Delete.
	(md_assemble): Remove imm_reloc handling.
	(mips_ip): Update commentary.  Use offset_expr and offset_reloc
	rather than imm_expr and imm_reloc for 'i', 'j' and 'u'.
	Use a temporary array rather than imm_reloc when parsing
	constant expressions.  Remove imm_reloc initialization.
	(mips16_ip): Update commentary.  Use offset_expr and offset_reloc
	for the relaxable field.  Use a relax_char variable to track the
	type of this field.  Remove imm_reloc initialization.