public SortableType adjust(SortableType sortableType) {
    return new SortableType(
        sortableType.getDex(), sortableType.getIndexMap(), adjust(sortableType.getClassDef()));
  }
Maps the index offsets from one dex file to those in another. For example, if you have string #5
in the old dex file, its position in the new dex file is {@code strings[5]}.
android/android_framework/dex-maker/src/main/java/com/android/dx/merge/IndexMap.java