[heap] Enforce finalization of marking at heap limit when optimizing for memory usage.

src/heap/heap-inl.h

Index: src/heap/heap-inl.h
diff --git a/src/heap/heap-inl.h b/src/heap/heap-inl.h
index d323f8cad96c6b8234d1730df6cc1ccc8ce73821..21f465fe7863741665c3eac6d7afee9542dcb3e9 100644
--- a/src/heap/heap-inl.h
+++ b/src/heap/heap-inl.h
@@ -384,7 +384,9 @@ bool Heap::InOldSpaceSlow(Address address) {
 }
 
 bool Heap::OldGenerationAllocationLimitReached() {
-  if (!incremental_marking()->IsStopped()) return false;
+  if (!incremental_marking()->IsStopped() && !ShouldOptimizeForMemoryUsage()) {
+    return false;
+  }
   return OldGenerationSpaceAvailable() < 0;
 }