RFR (XS/T) 8252691: Build failure after JDK-8252481

[Aleksey Shipilev]

Bug:
   https://bugs.openjdk.java.net/browse/JDK-8252691

Fix:

diff -r 33aa4ce7622f src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp        Wed Sep 02 11:47:59 2020 +0530
+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp        Wed Sep 02 08:59:13 2020 +0200
@@ -82,4 +82,5 @@
  #include "runtime/vmThread.hpp"
  #include "services/mallocTracker.hpp"
+#include "services/memTracker.hpp"
  #include "utilities/powerOfTwo.hpp"

Testing: local builds

-- 
Thanks,
-Aleksey