// arm64 machine configured with 39-bit VMA).
func isUnsupportedVMASize(w *work) bool {
	unsupportedVMA := []byte("unsupported VMA range")
	return strings.Contains(w.dt.name, ":race") && bytes.Contains(w.out.Bytes(), unsupportedVMA)
}

// isEnvSet reports whether the environment variable evar is
// set in the environment.
func isEnvSet(evar string) bool {