Measure ExitBootServices failure case

Signed-off-by: Chao Zhang<chao.b.zhang@intel.com>
Reviewed-by: Dong Guo<guo.dong@intel.com>
Reviewed-by: Gao Liming<liming.gao@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13581 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c

@@ -690,6 +690,10 @@ CoreExitBootServices (
   //
   Status = CoreTerminateMemoryMap (MapKey);
   if (EFI_ERROR (Status)) {
+    //
+    // Notify other drivers that ExitBootServices fail 
+    //
+    CoreNotifySignalList (&gEventExitBootServicesFailedGuid);
     return Status;
   }