public CstArray getStaticValuesConstant() {
    if ((staticValuesConstant == null) && (staticFields.size() != 0)) {
      staticValuesConstant = makeStaticValuesConstant();
    }

    return staticValuesConstant;
  }
Gets a {@link CstArray} corresponding to {@link #staticValues} if it contains any non-zero
non-{@code null} values.

@return {@code null-ok;} the corresponding constant or {@code null} if there are no values to
    encode
android/android_framework/dex-maker/src/main/java/com/android/dx/dex/file/ClassDataItem.java