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Optimize TransactionIdIsCurrentTransactionId().

If the passed in xid is the current top transaction, we can do a fastcheck and exit early. This should work well for the current heap butalso works very well for proposed AMs that don't use a separate xidfor subtransactions.Author: Ashwin Agrawal, based on a suggestion from Andres FreundReviewed-by: Thomas MunroDiscussion:https://postgr.es/m/CALfoeiv0k3hkEb3Oqk%3DziWqtyk2Jys1UOK5hwRBNeANT_yX%2Bng%40mail.gmail.com

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src/backend/access/transam
- xact.c

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`‎src/backend/access/transam/xact.c`

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Original file line number	Diff line number	Diff line change
`@@ -871,6 +871,9 @@ TransactionIdIsCurrentTransactionId(TransactionId xid)`
`871`	`871`	`if (!TransactionIdIsNormal(xid))`
`872`	`872`	`return false;`
`873`	`873`
	`874`	`+if (TransactionIdEquals(xid,GetTopTransactionIdIfAny()))`
	`875`	`+return true;`
	`876`	`+`
`874`	`877`	`/*`
`875`	`878`	`* In parallel workers, the XIDs we must consider as current are stored in`
`876`	`879`	`* ParallelCurrentXids rather than the transaction-state stack. Note that`

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Commit695c597

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`‎src/backend/access/transam/xact.c`

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