if (VM.VerifyAssertions) VM.assert(VM.NOT_REACHED);
if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
  public static void setThreadSwitchBit() {    if (VM.VerifyAssertions) VM.assert(VM.NOT_REACHED);  // call site should have been hijacked by magic in compiler  }  /** Clear bit in thread switch condition register. */  public static void clearThreadSwitchBit() {    if (VM.VerifyAssertions) VM.assert(VM.NOT_REACHED);  // call site should have been hijacked by magic in compiler  }       //---------------------------------------//  //       Stackframe Manipulation         //  //---------------------------------------//  /**    * Get fp for parent frame    * @param fp frame pointer for child frame   */  public static VM_Address getCallerFramePointer(VM_Address fp) {    if (VM.VerifyAssertions) VM.assert(VM.NOT_REACHED);  // call site should have been hijacked by magic in compiler    return null;  }