[heap] Pause black allocation during GCs

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index b230e552a881e6007741f1846f889d3d5a8906a8..6bac44ee6d906d9c9f4b94d9a580879b530a0a2d 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -820,6 +820,7 @@ class Page : public MemoryChunk {
   size_t ShrinkToHighWaterMark();
 
   V8_EXPORT_PRIVATE void CreateBlackArea(Address start, Address end);
+  void DestroyBlackArea(Address start, Address end);
 
 #ifdef DEBUG
   void Print();
@@ -2076,6 +2077,7 @@ class V8_EXPORT_PRIVATE PagedSpace : NON_EXPORTED_BASE(public Space) {
   void EmptyAllocationInfo();
 
   void MarkAllocationInfoBlack();
+  void UnmarkAllocationInfo();
 
   void AccountAllocatedBytes(size_t bytes) {
     accounting_stats_.AllocateBytes(bytes);