func (pcs Trace) TrimBelowName(name string) Trace {
	for len(pcs) > 0 && pcs[0].name() != name {
		pcs = pcs[1:]
	}
	return pcs
}
func (pcs Trace) TrimBelowName(name string) Trace {
	for len(pcs) > 0 && pcs[0].name() != name {
		pcs = pcs[1:]
	}
	return pcs
}
// TrimBelowName returns a slice of the Trace with all entries below the
// lowest with function name name removed.