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Be sure to release proc->backendLock after SetupLockInTable() failure.

The various places that transferred fast-path locks to the main lock tableneglected to release the PGPROC's backendLock if SetupLockInTable faileddue to being out of shared memory. In most cases this is no big deal sinceensuing error cleanup would release all held LWLocks anyway. But there aresome hot-standby functions that don't consider failure ofFastPathTransferRelationLocks to be a hard error, and in those cases thisoversight could lead to system lockup. For consistency, make all of theseplaces look the same as FastPathTransferRelationLocks.Noted while looking for the cause of Dan Wood's bugs --- this wasn't it,but it's a bug anyway.

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src/backend/storage/lmgr
- lock.c

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`‎src/backend/storage/lmgr/lock.c`

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Original file line number	Diff line number	Diff line change
`@@ -2536,6 +2536,7 @@ FastPathTransferRelationLocks(LockMethod lockMethodTable, const LOCKTAG *locktag`
`2536`	`2536`	`if (!proclock)`
`2537`	`2537`	`{`
`2538`	`2538`	`LWLockRelease(partitionLock);`
	`2539`	`+LWLockRelease(proc->backendLock);`
`2539`	`2540`	`return false;`
`2540`	`2541`	`}`
`2541`	`2542`	`GrantLock(proclock->tag.myLock,proclock,lockmode);`
`@@ -2591,6 +2592,7 @@ FastPathGetRelationLockEntry(LOCALLOCK *locallock)`
`2591`	`2592`	`if (!proclock)`
`2592`	`2593`	`{`
`2593`	`2594`	`LWLockRelease(partitionLock);`
	`2595`	`+LWLockRelease(MyProc->backendLock);`
`2594`	`2596`	`ereport(ERROR,`
`2595`	`2597`	`(errcode(ERRCODE_OUT_OF_MEMORY),`
`2596`	`2598`	`errmsg("out of shared memory"),`
`@@ -4054,6 +4056,7 @@ VirtualXactLock(VirtualTransactionId vxid, bool wait)`
`4054`	`4056`	`if (!proclock)`
`4055`	`4057`	`{`
`4056`	`4058`	`LWLockRelease(partitionLock);`
	`4059`	`+LWLockRelease(proc->backendLock);`
`4057`	`4060`	`ereport(ERROR,`
`4058`	`4061`	`(errcode(ERRCODE_OUT_OF_MEMORY),`
`4059`	`4062`	`errmsg("out of shared memory"),`

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Commit8b15155

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`‎src/backend/storage/lmgr/lock.c`

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