[async-iteration] implement Async-from-Sync Iterator

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 50128a25ecc8b3e850960997428f4332c1957150..cec3221f9d3b665582eb1cbfa5eb67ed01f7a2c4 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -164,6 +164,7 @@ TYPE_CHECKER(JSPromise, JS_PROMISE_TYPE)
 TYPE_CHECKER(JSRegExp, JS_REGEXP_TYPE)
 TYPE_CHECKER(JSSet, JS_SET_TYPE)
 TYPE_CHECKER(JSSetIterator, JS_SET_ITERATOR_TYPE)
+TYPE_CHECKER(JSAsyncFromSyncIterator, JS_ASYNC_FROM_SYNC_ITERATOR_TYPE)
 TYPE_CHECKER(JSStringIterator, JS_STRING_ITERATOR_TYPE)
 TYPE_CHECKER(JSTypedArray, JS_TYPED_ARRAY_TYPE)
 TYPE_CHECKER(JSValue, JS_VALUE_TYPE)
@@ -656,6 +657,7 @@ CAST_ACCESSOR(JSPromiseCapability)
 CAST_ACCESSOR(JSPromise)
 CAST_ACCESSOR(JSSet)
 CAST_ACCESSOR(JSSetIterator)
+CAST_ACCESSOR(JSAsyncFromSyncIterator)
 CAST_ACCESSOR(JSStringIterator)
 CAST_ACCESSOR(JSArrayIterator)
 CAST_ACCESSOR(JSTypedArray)
@@ -8209,6 +8211,9 @@ ACCESSORS(JSArrayIterator, object, Object, kIteratedObjectOffset)
 ACCESSORS(JSArrayIterator, index, Object, kNextIndexOffset)
 ACCESSORS(JSArrayIterator, object_map, Object, kIteratedObjectMapOffset)
 
+ACCESSORS(JSAsyncFromSyncIterator, sync_iterator, JSReceiver,
+          kSyncIteratorOffset)
+
 ACCESSORS(JSStringIterator, string, String, kStringOffset)
 SMI_ACCESSORS(JSStringIterator, index, kNextIndexOffset)