newgran := mfr.CounterGranularity()
	newmode := mfr.CounterMode()
	if err := mm.SetModeAndGranularity(mdf, newmode, newgran); err != nil {
		fatal("%v", err)
	}
}

func (mm *metaMerge) beginCounterDataFile(cdr *decodecounter.CounterDataReader) {
	state := argvalues{
		osargs: cdr.OsArgs(),
		goos:   cdr.Goos(),
		goarch: cdr.Goarch(),
	}
	mm.astate.Merge(state)
}