private static int UnregisterNatives(VM_JNIEnvironment env) {
private static int UnregisterNatives(VM_JNIEnvironment env, int classJREF) {
  private static int UnregisterNatives(VM_JNIEnvironment env) {    if (traceJNI) VM.sysWrite("JNI called: UnregisterNatives  \n");    VM.sysWrite("JNI ERROR: UnregisterNatives not implemented yet.");    VM.sysExit(VM.exitStatusUnsupportedInternalOp);    return -1;   }