int instructionOffset,
Offset instructionOffset,
  public void setupIterator(VM_CompiledMethod compiledMethod,                             int instructionOffset,                             Address framePtr) {     this.framePtr = framePtr;    // processore reg (R16) was saved in reg save area at offset -72     // from callers frameptr, and after GC will be used to set     // processor reg upon return to java.  it must be reported    // so it will be relocated, if necessary    //    Address callers_fp = this.framePtr.loadAddress();    //-#if RVM_WITH_POWEROPEN_ABI    jniSavedReturnAddr       = callers_fp.sub(JNI_PROLOG_RETURN_ADDRESS_OFFSET);    //-#endif    //-#if RVM_WITH_SVR4_ABI || RVM_WITH_MACH_O_ABI    // ScanThread calls getReturnAddressLocation() to get this stack frame    // it is already processed    jniSavedReturnAddr       = Address.zero();    //-#endif    // set the GC flag in the Java to C frame to indicate GC occurred    // this forces saved non volatile regs to be restored from save area    // where those containing refs have been relocated if necessary    //    callers_fp.sub(JNI_GC_FLAG_OFFSET).store(1);  }