dumpFileSeq uint8 // the sequence numbers of dump file. (%s_%02d__%s.dump", funcname, dumpFileSeq, phaseName)
	IsPgoHot    bool

	// when register allocation is done, maps value ids to locations
	RegAlloc []Location

	// temporary registers allocated to rare instructions
	tempRegs map[ID]*Register

	// map from LocalSlot to set of Values that we want to store in that slot.
	NamedValues map[LocalSlot][]*Value