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

	* config/tc-mips.c (mips_isa): New static variable.
	(md_begin): Initialize mips_isa based on TARGET_CPU.  Don't sanity
	check macros.  Set text alignment and GP size here.
	(md_assemble): Don't set text alignment and GP size here.
	(append_insn): Don't insert NOPs for load delays if mips_isa >= 2.
	Use the right mask and shift for WRITE_FPR_T and WRITE_FPR_S.  Add
	a NOP after a branch likely.
	(mips_emit_delays): Don't insert NOPS for load delays if mips_isa
	>= 2.
	(macro): Support r6000 and r4000 macros.
	(mips_ip): Check insn ISA level against mips_isa before using it.
	Added 'x' case for ignored register.
	(md_parse_option): Handle -mipsN and -mcpu=XX.