if (VM.VerifyAssertions) VM.assert((delta>>>23) == 0);
if (VM.VerifyAssertions) VM._assert((delta>>>23) == 0);
  final void patchUnconditionalBranch(int sourceMachinecodeIndex) {    if (VM.TraceAssembler) System.out.print(" <- " + hex(sourceMachinecodeIndex << 2));    int delta = mIP - sourceMachinecodeIndex;    INSTRUCTION instr = mc.getInstruction(sourceMachinecodeIndex);    if (VM.VerifyAssertions) VM.assert((delta>>>23) == 0); // delta (positive) fits in 24 bits    instr |= (delta<<2);    mc.putInstruction(sourceMachinecodeIndex, instr);  }