[heap] pause observers during mark-compact

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 46f62f001d4f2da005586b16de92b8191520458a..945add8e95d370444b1882e9fe4f97ca599e7955 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1382,6 +1382,8 @@ void Heap::CallGCEpilogueCallbacks(GCType gc_type,
 
 
 void Heap::MarkCompact() {
+  PauseInlineAllocationObserversScope pause_observers(new_space());
+
   gc_state_ = MARK_COMPACT;
   LOG(isolate_, ResourceEvent("markcompact", "begin"));
 
@@ -1586,7 +1588,7 @@ void Heap::Scavenge() {
 
   // Bump-pointer allocations done during scavenge are not real allocations.
   // Pause the inline allocation steps.
-  new_space()->PauseInlineAllocationObservers();
+  PauseInlineAllocationObserversScope pause_observers(new_space());
 
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) VerifyNonPointerSpacePointers(this);
@@ -1717,8 +1719,6 @@ void Heap::Scavenge() {
   // Set age mark.
   new_space_.set_age_mark(new_space_.top());
 
-  new_space()->ResumeInlineAllocationObservers();
-
   array_buffer_tracker()->FreeDead(true);
 
   // Update how much has survived scavenge.