private LocalsArray getSecondaryForLabel(int label) {
    if (label >= secondaries.size()) {
      return null;
    }

    return secondaries.get(label);
  }
Gets the {@code LocalsArray} instance for a specified subroutine caller label, or null if label
has no locals associated with it.

@param label {@code >= 0;} subroutine caller label
@return {@code null-ok;} locals if available.
android/android_framework/dex-maker/src/main/java/com/android/dx/cf/code/LocalsArraySet.java