[PATCHES] Use latestCompletedXid to slightly optimize TransactionIdIsInProgress

[Florian G. Pflug]

Hi

Since we already advance latestCompletedXid on subtransaction and toplevel

transaction aborts, we might as well use the value to rule out surely in-progress transctions at the top of TransactionIdIsInProgress.

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greetings, Florian Pflug

inprogress.patch.gz
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