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