Merge pull request dotnet/coreclr#18938 from vancem/EventSourceShutdown
authorVance Morrison <vancem@microsoft.com>
Tue, 17 Jul 2018 17:42:28 +0000 (10:42 -0700)
committerGitHub <noreply@github.com>
Tue, 17 Jul 2018 17:42:28 +0000 (10:42 -0700)
Add back in code deleted in .NET Core port.

Commit migrated from https://github.com/dotnet/coreclr/commit/f4145a147aa40639747c08ec6eeac6ddcc788e36


Trivial merge