Commits on Jul 28, 2021

1. Fix EventSource shutdown deadlock …

   Fixes dotnet#48342
   
   A deadlock was occuring because we held the EventListenersLock
   while calling into EventUnregister which will take ETW's own native
   lock. In the case of ETW sending an enable/disable notification
   these locks are taken in reverse order which triggers a deadlock.
   
   The fix is to ensure that we always order the locks so that any code
   path taking both locks always takes the ETW lock first. In this case
   it meant accumulating the list of event sources to dispose under
   the lock but then exiting the lock prior to calling Dispose() which
   will eventually call EventUnregister.

   

   noahfalk committed Jul 28, 2021
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