Do not GC stress in preemptive mode

Author: VSadov

src/coreclr/vm/gccover.cpp

@@ -1417,16 +1417,9 @@ BOOL OnGcCoverageInterrupt(PCONTEXT regs)
         RemoveGcCoverageInterrupt(instrPtr, savedInstrPtr, gcCover, offset);
         return TRUE;
     }
-
-    // If the thread is in preemptive mode then we must be in a
-    // PInvoke stub, a method that has an inline PInvoke frame,
-    // or be in a reverse PInvoke stub that's about to return.
-    //
-    // The PInvoke cases should should properly report GC refs if we
-    // trigger GC here. But a reverse PInvoke stub may over-report
-    // leading to spurious failures, as we would not normally report
-    // anything for this method at this point.
-    if (!pThread->PreemptiveGCDisabled() && pMD->HasUnmanagedCallersOnlyAttribute())
+    
+    // The thread is in preemptive mode. Normally, it should not be able to trigger GC.
+    if (!pThread->PreemptiveGCDisabled())
     {
         RemoveGcCoverageInterrupt(instrPtr, savedInstrPtr, gcCover, offset);
         return TRUE;