Version 4.5.53.1 (cherry-pick)

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 9a4e88d9c4c8be444253f82aea323b241242febd..7494330263ea37c0ec0eb32fba3f1b3a19ceaff2 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -3041,10 +3041,6 @@ bool MarkCompactCollector::TryPromoteObject(HeapObject* object,
   AllocationResult allocation = old_space->AllocateRaw(object_size, alignment);
   if (allocation.To(&target)) {
     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()->IncrementPromotedObjectsSize(object_size);
     return true;
   }
@@ -4371,6 +4367,7 @@ void MarkCompactCollector::SweepSpaces() {
 #ifdef DEBUG
   state_ = SWEEP_SPACES;
 #endif
+  heap()->FreeDeadArrayBuffers();
 
   MoveEvacuationCandidatesToEndOfPagesList();
 
@@ -4398,8 +4395,6 @@ void MarkCompactCollector::SweepSpaces() {
 
   EvacuateNewSpaceAndCandidates();
 
-  heap()->FreeDeadArrayBuffers(false);
-
   // ClearNonLiveReferences depends on precise sweeping of map space to
   // detect whether unmarked map became dead in this collection or in one
   // of the previous ones.