An object should only be promoted to the old generation if it survived a scavenge operation.

test/cctest/test-mark-compact.cc

Index: test/cctest/test-mark-compact.cc
diff --git a/test/cctest/test-mark-compact.cc b/test/cctest/test-mark-compact.cc
index bea0d340633f0fba6cf53358276791320dd35c30..3c16f2abbc28e214b3056bd542e084442836e9a5 100644
--- a/test/cctest/test-mark-compact.cc
+++ b/test/cctest/test-mark-compact.cc
@@ -92,7 +92,8 @@ TEST(Promotion) {
   CHECK(heap->InSpace(*array, NEW_SPACE));
 
   // Call mark compact GC, so array becomes an old object.
-  heap->CollectGarbage(OLD_POINTER_SPACE);
+  heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);
+  heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);
 
   // Array now sits in the old space
   CHECK(heap->InSpace(*array, OLD_POINTER_SPACE));