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

src/deoptimizer.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/deoptimizer.h"
 
 #include <memory>
 
 #include "src/accessors.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 3778 matching lines @@
       Handle<Object> iterated_string = materializer.FieldAt(value_index);
       Handle<Object> next_index = materializer.FieldAt(value_index);
       object->set_properties(FixedArray::cast(*properties));
       object->set_elements(FixedArrayBase::cast(*elements));
       CHECK(iterated_string->IsString());
       object->set_string(String::cast(*iterated_string));
       CHECK(next_index->IsSmi());
       object->set_index(Smi::cast(*next_index)->value());
       return object;
     }
+    case JS_ASYNC_FROM_SYNC_ITERATOR_TYPE: {
+      Handle<JSAsyncFromSyncIterator> object =
+          Handle<JSAsyncFromSyncIterator>::cast(
+              isolate_->factory()->NewJSObjectFromMap(map, NOT_TENURED));
+      slot->value_ = object;
+      Handle<Object> properties = materializer.FieldAt(value_index);
+      Handle<Object> elements = materializer.FieldAt(value_index);
+      Handle<Object> sync_iterator = materializer.FieldAt(value_index);
+      object->set_properties(FixedArray::cast(*properties));
+      object->set_elements(FixedArrayBase::cast(*elements));
+      object->set_sync_iterator(JSReceiver::cast(*sync_iterator));
+      return object;
+    }
     case JS_ARRAY_TYPE: {
       Handle<JSArray> object = Handle<JSArray>::cast(
           isolate_->factory()->NewJSObjectFromMap(map, NOT_TENURED));
       slot->value_ = object;
       Handle<Object> properties = materializer.FieldAt(value_index);
       Handle<Object> elements = materializer.FieldAt(value_index);
       Handle<Object> length = materializer.FieldAt(value_index);
       object->set_properties(FixedArray::cast(*properties));
       object->set_elements(FixedArrayBase::cast(*elements));
       object->set_length(*length);
@@ skipping 418 matching lines @@
       CHECK(value_info->IsMaterializedObject());
 
       value_info->value_ =
           Handle<Object>(previously_materialized_objects->get(i), isolate_);
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8