Reland "[heap] Fine-grained JSArrayBuffer tracking"

test/cctest/heap/heap-utils.cc

Index: test/cctest/heap/heap-utils.cc
diff --git a/test/cctest/heap/heap-utils.cc b/test/cctest/heap/heap-utils.cc
index e6daa454417ab5b78d87873e4420ea61b372522a..8abc5c3b5c63d2e863080effda3d2c0a69a2396a 100644
--- a/test/cctest/heap/heap-utils.cc
+++ b/test/cctest/heap/heap-utils.cc
@@ -141,6 +141,21 @@ void SimulateFullSpace(v8::internal::PagedSpace* space) {
   space->ClearStats();
 }
 
+void AbandonCurrentlyFreeMemory(PagedSpace* space) {
+  space->EmptyAllocationInfo();
+  PageIterator pit(space);
+  while (pit.has_next()) {
+    pit.next()->MarkNeverAllocateForTesting();
+  }
+}
+
+void GcAndSweep(Heap* heap, AllocationSpace space) {
+  heap->CollectGarbage(space);
+  if (heap->mark_compact_collector()->sweeping_in_progress()) {
+    heap->mark_compact_collector()->EnsureSweepingCompleted();
+  }
+}
+
 }  // namespace heap
 }  // namespace internal
 }  // namespace v8