private boolean involvedInSubroutine(int label, int subroutineStart) {
      IntList subroutinesList = labelToSubroutines.get(label);
      return (subroutinesList != null
          && subroutinesList.size() > 0
          && subroutinesList.top() == subroutineStart);
    }
Checks to see if a specified label is involved in a specified subroutine.

@param label {@code >= 0;} a basic block label
@param subroutineStart {@code >= 0;} a subroutine as identified by the label of its start
    block
@return true if the block is dominated by the subroutine call
android/android_framework/dex-maker/src/main/java/com/android/dx/cf/code/Ropper.java