James O'Beirne 617661703a validation: make CChainState::m_mempool optional ...

Since we now have multiple chainstate objects, only one of them is active at any given
time. An active chainstate has a mempool, but there's no point to others having one.

This change will simplify proposed assumeutxo semantics. See the discussion here:
https://github.com/bitcoin/bitcoin/pull/15606#pullrequestreview-692965905

Co-authored-by: Russell Yanofsky <russ@yanofsky.org>

2021-07-13 11:11:35 -04:00

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