don't crash VS on fatal error on esent (fatal errors include things such as...

don't crash VS on fatal error on esent (fatal errors include things such as out of disk space, log file got corrupted by other process and etc).

in these cases, we will recover the issue by using memory cache. (changeset 1346037)

Src/Workspaces/Core/Log/FunctionId.cs

@@ -266,6 +266,7 @@ internal enum FunctionId
         WorkCoordinator_Shutdown,
 
         DiagnosticAnalyzerService_Analyzers,
-        PersistedSemanticVersion_Info
+        PersistedSemanticVersion_Info,
+        Esent_Exceptions
     }
 }
\ No newline at end of file