public void putFieldWriteBarrier(VM_Address src, int offset, VM_Address tgt)
final public void putFieldWriteBarrier(VM_Address src, int offset, VM_Address tgt)
  public void putFieldWriteBarrier(VM_Address src, int offset, VM_Address tgt)    throws VM_PragmaInline {    writeBarrier(src.add(offset), tgt);  }