public final void postCopy(VM_Address ref, Object[] tib, int bytes, boolean isScalar) {
public final void postCopy(VM_Address ref, Object[] tib, int bytes) {
  public final void postCopy(VM_Address ref, Object[] tib, int bytes,                             boolean isScalar) {    VM_Interface.sysFail("no postCopy in noGC");  } 