WIP SharedArrayBuffer implementation

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index f73bb37f4689a10352e18ce7d20af562ca950c8b..1420d68da94b6ddbda6048f8afeefdf5d92f0437 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1585,6 +1585,8 @@ void HeapObject::IterateBody(InstanceType type, int object_size,
     case JS_ARRAY_BUFFER_TYPE:
     case JS_TYPED_ARRAY_TYPE:
     case JS_DATA_VIEW_TYPE:
+    case JS_SHARED_ARRAY_BUFFER_TYPE:
+    case JS_SHARED_TYPED_ARRAY_TYPE:
     case JS_SET_TYPE:
     case JS_MAP_TYPE:
     case JS_SET_ITERATOR_TYPE:
@@ -16897,7 +16899,8 @@ Handle<JSArrayBuffer> JSTypedArray::MaterializeArrayBuffer(
   Handle<FixedTypedArrayBase> fixed_typed_array(
       FixedTypedArrayBase::cast(typed_array->elements()));
   Runtime::SetupArrayBufferAllocatingData(isolate, buffer,
-      fixed_typed_array->DataSize(), false);
+                                          fixed_typed_array->DataSize(), false,
+                                          typed_array->is_shared());
   memcpy(buffer->backing_store(),
          fixed_typed_array->DataPtr(),
          fixed_typed_array->DataSize());