public final int findLineNumberForInstruction(int instructionOffset) {
public final int findLineNumberForInstruction(Offset instructionOffset) {
  public final int findLineNumberForInstruction(int instructionOffset) {    int bci = _mcMap.getBytecodeIndexForMCOffset(instructionOffset);    if (bci < 0)      return 0;    return ((VM_NormalMethod)method).getLineNumberForBCIndex(bci);  }