@Override
          public int compare(PositionList.Entry a, PositionList.Entry b) {
            return a.getAddress() - b.getAddress();
          }
Builds a list of position entries, sorted by ascending address.

@return A sorted positions list
android/android_framework/dex-maker/src/main/java/com/android/dx/dex/file/DebugInfoEncoder.java