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Add C comment about why we send cache invalidation messages for

session-local objects.

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Original file line number	Diff line number	Diff line change
`@@ -812,6 +812,10 @@ ProcessCommittedInvalidationMessages(SharedInvalidationMessage *msgs,`
`812`	`812`	`* about CurrentCmdInvalidMsgs too, since those changes haven't touched`
`813`	`813`	`* the caches yet.`
`814`	`814`	`*`
	`815`	`+ * We still send invalidation messages for session-local objects to other`
	`816`	`+ * backends because, while other backends cannot see any tuples, they can`
	`817`	`+ * drop tables that are session-local to another session.`
	`818`	`+ *`
`815`	`819`	`* In any case, reset the various lists to empty. We need not physically`
`816`	`820`	`* free memory here, since TopTransactionContext is about to be emptied`
`817`	`821`	`* anyway.`

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