Implement aging of maps embedded in optimized code.

test/cctest/test-object-observe.cc

Index: test/cctest/test-object-observe.cc
diff --git a/test/cctest/test-object-observe.cc b/test/cctest/test-object-observe.cc
index 8851d888933947143bd66f3850dd683a37d40de8..a3c5ce6a32edd7395c08a87c471d217005cf48ac 100644
--- a/test/cctest/test-object-observe.cc
+++ b/test/cctest/test-object-observe.cc
@@ -683,7 +683,7 @@ static void CheckSurvivingGlobalObjectsCount(int expected) {
   // the first garbage collection but some of the maps have already
   // been marked at that point.  Therefore some of the maps are not
   // collected until the second garbage collection.
-  CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
+  CcTest::heap()->CollectAllGarbage(i::Heap::kReduceMemoryFootprintMask);
   CcTest::heap()->CollectAllGarbage(i::Heap::kMakeHeapIterableMask);
   int count = GetGlobalObjectsCount();
 #ifdef DEBUG