* config/tc-mips.c (mips_cpu): New static variable.

	* config/tc-mips.c (mips_cpu): New static variable.
	(insns_since_cache_access): New static variable.
	(md_begin): Set mips_cpu as well as mips_isa.
	(append_insn): If mips_cpu is 4600, require four nop instructions
	between an instruction which accesses the cache and certain CACHE
	instructions.  Keep track of the number of instructions seen since
	an instruction which accesses the cache.
	(md_parse_option): Set mips_cpu as well as mips_isa.
PR 5433.