EventPipe fixes (dotnet/coreclr#24952)

Commit migrated from https://github.com/dotnet/coreclr/commit/902c6b772e9132389cbfea8c759315620e7c0e57

src/coreclr/src/vm/eventpipe.cpp

@@ -460,7 +460,7 @@ void EventPipe::DisableInternal(EventPipeSessionID id, EventPipeProviderCallback
 EventPipeSession *EventPipe::GetSession(EventPipeSessionID id)
 {
     LIMITED_METHOD_CONTRACT;
-    _ASSERTE(IsLockOwnedByCurrentThread());
+    CrstHolder _crst(GetLock());
 
     if (s_pSessions == nullptr)
         return nullptr;

src/coreclr/src/vm/eventpipebuffermanager.cpp

@@ -616,7 +616,7 @@ EventPipeEventInstance* EventPipeBufferManager::GetNextEvent()
 {
     CONTRACTL
     {
-        NOTHROW;
+        THROWS;
         GC_NOTRIGGER;
         MODE_ANY;
         PRECONDITION(!EventPipe::IsLockOwnedByCurrentThread());

src/coreclr/src/vm/eventpipesession.cpp

@@ -182,7 +182,9 @@ DWORD WINAPI EventPipeSession::ThreadProc(void *args)
             pEventPipeSession->SetThreadShutdownEvent();
 
             if (!fSuccess)
-                pEventPipeSession->Disable();
+            {
+                EventPipe::RunWithCallbackPostponed([pEventPipeSession](EventPipeProviderCallbackDataQueue *pEventPipeProviderCallbackDataQueue){pEventPipeSession->Disable();});
+            }
         }
         EX_CATCH
         {