@Override
        Iterable<FieldSpec> additionalFields() {
          return ImmutableList.of();
        }
Builds a {@link FieldSpec} for use in property caching. Field will be {@code private
transient volatile} and have the given type and name. If the @LazyInit annotation is
available it is added as well.
value/src/main/java/com/google/auto/value/extension/memoized/processor/MemoizeExtension.java