[async-iteration] add support for for-await-of loops in Async Functions

src/interpreter/bytecode-array-builder.cc

 // Copyright 2015 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/interpreter/bytecode-array-builder.h"
 
 #include "src/globals.h"
 #include "src/interpreter/bytecode-array-writer.h"
 #include "src/interpreter/bytecode-dead-code-optimizer.h"
 #include "src/interpreter/bytecode-label.h"
@@ skipping 602 matching lines @@
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::LoadIteratorProperty(
     Register object, int feedback_slot) {
   size_t name_index = IteratorSymbolConstantPoolEntry();
   OutputLdaNamedProperty(object, name_index, feedback_slot);
   return *this;
 }
 
+BytecodeArrayBuilder& BytecodeArrayBuilder::LoadAsyncIteratorProperty(
+    Register object, int feedback_slot) {
+  size_t name_index = AsyncIteratorSymbolConstantPoolEntry();
+  OutputLdaNamedProperty(object, name_index, feedback_slot);
+  return *this;
+}
+
 BytecodeArrayBuilder& BytecodeArrayBuilder::StoreDataPropertyInLiteral(
     Register object, Register name, DataPropertyInLiteralFlags flags,
     int feedback_slot) {
   OutputStaDataPropertyInLiteral(object, name, flags, feedback_slot);
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::StoreNamedProperty(
     Register object, size_t name_index, int feedback_slot,
     LanguageMode language_mode) {
@@ skipping 537 matching lines @@
     RegisterList reg_list) {
   DCHECK(RegisterListIsValid(reg_list));
   if (register_optimizer_)
     register_optimizer_->PrepareOutputRegisterList(reg_list);
   return static_cast<uint32_t>(reg_list.first_register().ToOperand());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8