[sourcekitd] Fix crash in onDocumentUpdateNotification #14355
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…g when cancelled from the other end If a client crashes and we tried to post notifications to the XPC connection, SourceKitService would go down too, as it never `xpc_retain`ed the connection. Resolves rdar://problem/36077481
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SourceKit didn't
xpc_retaina globally stored XPC connection reference,MainConnection, allowing it to be used in an invalid state. This happened if the client cancelled the connection or crashed while SourceKit was busy gathering semantic information for a document. SourceKit would use the invalid connection to try to notify the client when it finished and crash.Resolves rdar://problem/36077481