* config/tc-mips.c (md_begin): Check for a cpu string of r8000 or

	* config/tc-mips.c (md_begin): Check for a cpu string of r8000 or
	r10000.  If mips_isa is 4, set the machine number to 8000.
	(append_insn): If mips_isa is at least 4, don't generate nops for
	coprocessor delays.  Check INSN_READ_FPR_R when setting
	mips_cprmask[1].
	(mips_emit_delays): If mips_isa is at least 4, don't generate nops
	for coprocessor delays.
	(mips_ip): Check for INSN_ISA4 instructions.  Handle new argument
	types 'h', 'R', 'N', and 'M'.
	(md_longopts): Accept "mips4".
	(md_parse_option): Handle -mips4, and -mcpu=10000 and -mcpu=8000.
	(s_mipsset): Permit .set mips4.