public static void initializeHeader(VM_Address ref, Object[] tib, int size, boolean isScalar) throws VM_PragmaUninterruptible {
public static void initializeHeader(VM_Address ref, Object[] tib, int size) throws VM_PragmaUninterruptible {
  public static void initializeHeader(VM_Address ref, Object[] tib, int size, boolean isScalar) throws VM_PragmaUninterruptible {    // nothing to do (no bytes of GC header)  }