Set addDependency(CompiledValue cv, RuntimeIterator itr) {
    Set<RuntimeIterator> ds = getDependencySet(cv, false);
    ds.add(itr);
    return ds;
  }
Add RuntimeIterator as a dependency of a CompiledValue. ASSUMPTION: unsynchronized, assumed to
be single-threaded.

@return the dependency set as a shortcut
geode-core/src/main/java/org/apache/geode/cache/query/internal/ExecutionContext.java