MAINT-5232: Loosen LLSingleton circularity constraints slightly.

LLSingleton explicitly supports circular dependencies: initialization
performed during an LLSingleton subclass's initSingleton() method may
recursively call that same subclass's getInstance() method. On the other hand,
circularity from a subclass constructor cannot be permitted, else
getInstance() would have to return a partially-constructed object.
Our dependency tracking circularity check initially forbade both. Loosen it to
permit references from within initSingleton().

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