public void onInsnsChanged() {
    // Definition list will need to be recomputed
    definitionList = null;

    // Use list will need to be recomputed
    useList = null;
    unmodifiableUseList = null;
  }
Indicates that the instruction list has changed or the SSA register count has increased, so
that internal datastructures that rely on it should be rebuild. In general, the various other
on* methods should be called in preference when changes occur if they are applicable.
android/android_framework/dex-maker/src/main/java/com/android/dx/ssa/SsaMethod.java