[5.0][sourcekitd] Fix crash in onDocumentUpdateNotification #14354
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SourceKit didn't
xpc_retain
a 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