Fix benchmark non-unity build

Signed-off-by: Nicholas Van Sickle <nvsickle@amazon.com>

Code/Framework/AzCore/Tests/DOM/DomPatchBenchmarks.cpp

@@ -9,6 +9,7 @@
 #include <AzCore/DOM/DomPatch.h>
 #include <AzCore/DOM/DomUtils.h>
 #include <AzCore/DOM/DomValue.h>
+#include <AzCore/DOM/DomComparison.h>
 #include <AzCore/Name/NameDictionary.h>
 #include <AzCore/UnitTest/TestTypes.h>
 #include <Tests/DOM/DomFixtures.h>