* config/tc-mips.c (MAX_NOPS): New macro.

	(history): Resize to 1 + MAX_NOPS.
	(fix_vr4120_class): New enumeration.
	(vr4120_conflicts): New variable.
	(init_vr4120_conflicts): New function.
	(md_begin): Call it.
	(insn_uses_reg): Constify first argument.
	(classify_vr4120_insn, insns_between, nops_for_insn, nops_for_sequence)
	(nops_for_insn_or_target): New functions.
	(append_insn): Use the new nops_for_* functions instead of inline
	delay checks.  Generalize prev_nop_frag handling to handle an
	arbitrary history length.  Insert nops into the history buffer
	once the number of nops in prev_nop_frag is fixed.
	(emit_delays): Use nops_for_insn instead of inline delay checks.

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