Reland of "[heap] Fine-grained JSArrayBuffer tracking"

test/cctest/heap/heap-utils.h

Index: test/cctest/heap/heap-utils.h
diff --git a/test/cctest/heap/heap-utils.h b/test/cctest/heap/heap-utils.h
index f7739d4b0eb72fd0fcec9723bde0c5668173868d..e03e6fa6e0461df12f6ec8a204a9975b782d09c8 100644
--- a/test/cctest/heap/heap-utils.h
+++ b/test/cctest/heap/heap-utils.h
@@ -40,6 +40,10 @@ void SimulateIncrementalMarking(i::Heap* heap, bool force_completion = true);
 // Helper function that simulates a full old-space in the heap.
 void SimulateFullSpace(v8::internal::PagedSpace* space);
 
+void AbandonCurrentlyFreeMemory(PagedSpace* space);
+
+void GcAndSweep(Heap* heap, AllocationSpace space);
+
 }  // namespace heap
 }  // namespace internal
 }  // namespace v8