[heap] introduce ArrayBufferTracker

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index b66dd5530389a4de2ef1b06c8f9ba38e965c5ca9..9bbb98bcfc02fd36afe1a766b579691c74608b8c 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -1871,8 +1871,7 @@ int MarkCompactCollector::DiscoverAndEvacuateBlackObjectsOnPage(
 
       MigrateObject(HeapObject::cast(target), object, size, NEW_SPACE);
       if (V8_UNLIKELY(target->IsJSArrayBuffer())) {
-        heap()->RegisterLiveArrayBuffer(
-            true, JSArrayBuffer::cast(target)->backing_store());
+        heap()->array_buffer_tracker()->MarkLive(JSArrayBuffer::cast(target));
       }
       heap()->IncrementSemiSpaceCopiedObjectSize(size);
     }
@@ -3098,7 +3097,7 @@ bool MarkCompactCollector::TryPromoteObject(HeapObject* object,
     MigrateObject(target, object, object_size, old_space->identity());
     // If we end up needing more special cases, we should factor this out.
     if (V8_UNLIKELY(target->IsJSArrayBuffer())) {
-      heap()->PromoteArrayBuffer(target);
+      heap()->array_buffer_tracker()->Promote(JSArrayBuffer::cast(target));
     }
     heap()->IncrementPromotedObjectsSize(object_size);
     return true;
@@ -4443,7 +4442,7 @@ void MarkCompactCollector::SweepSpaces() {
   // EvacuateNewSpaceAndCandidates iterates over new space objects and for
   // ArrayBuffers either re-registers them as live or promotes them. This is
   // needed to properly free them.
-  heap()->FreeDeadArrayBuffers(false);
+  heap()->array_buffer_tracker()->FreeDead(false);
 
   // Clear the marking state of live large objects.
   heap_->lo_space()->ClearMarkingStateOfLiveObjects();