[heap] Reland: Take page lock when scavenging old to new references in Scavenger.

src/heap/array-buffer-tracker-inl.h

Index: src/heap/array-buffer-tracker-inl.h
diff --git a/src/heap/array-buffer-tracker-inl.h b/src/heap/array-buffer-tracker-inl.h
index f5bdead89a5d74f7b791d6ba170ab2bbb5474ac0..d20f1280028dd8f4cb2545d1a763ff0927ecc1c2 100644
--- a/src/heap/array-buffer-tracker-inl.h
+++ b/src/heap/array-buffer-tracker-inl.h
@@ -17,7 +17,7 @@ void ArrayBufferTracker::RegisterNew(Heap* heap, JSArrayBuffer* buffer) {
   size_t length = NumberToSize(buffer->byte_length());
   Page* page = Page::FromAddress(buffer->address());
   {
-    base::LockGuard<base::Mutex> guard(page->mutex());
+    base::LockGuard<base::RecursiveMutex> guard(page->mutex());
     LocalArrayBufferTracker* tracker = page->local_tracker();
     if (tracker == nullptr) {
       page->AllocateLocalTracker();
@@ -39,7 +39,7 @@ void ArrayBufferTracker::Unregister(Heap* heap, JSArrayBuffer* buffer) {
   Page* page = Page::FromAddress(buffer->address());
   size_t length = 0;
   {
-    base::LockGuard<base::Mutex> guard(page->mutex());
+    base::LockGuard<base::RecursiveMutex> guard(page->mutex());
     LocalArrayBufferTracker* tracker = page->local_tracker();
     DCHECK_NOT_NULL(tracker);
     length = tracker->Remove(buffer);