@Value.Lazy
    public boolean hasBuilderModule() {
      return hasElement((FactoryMirror.qualifiedName()));
    }
Try to find Guava's object util classes if they're available. First lookup for
{@code base.MoreObjects} then {@code base.Objects}.
Return {@code null} if not found.
@return full class name for Guava's {@code MoreObjects} / {@code Objects} or {@code null} if
    such class doesn't exist in classpath
value-processor/src/org/immutables/value/processor/meta/Proto.java