[heap] Prefer mark-compact over scavenger if incremental marking

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index e47478d4ea28b0a7578e0b5864936021c1c4ed41..29cfd04117fd994f4a3f4126200192e69df42704 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -264,6 +264,12 @@ GarbageCollector Heap::SelectGarbageCollector(AllocationSpace space,
     return MARK_COMPACTOR;
   }
 
+  if (incremental_marking()->NeedsFinalization() &&
+      OldGenerationSpaceAvailable() == 0) {
+    *reason = "Incremental marking needs finalization";
+    return MARK_COMPACTOR;
+  }
+
   // Is there enough space left in OLD to guarantee that a scavenge can
   // succeed?
   //