WIP [esnext] implement async iteration proposal

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 821 matching lines @@
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::LoadModuleVariable(int cell_index,
                                                                int depth) {
   OutputLdaModuleVariable(cell_index, depth);
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::SuspendGenerator(
-    Register generator) {
-  OutputSuspendGenerator(generator);
+    Register generator, Yield::YieldType type) {
+  if (type == Yield::kNormal || type == Yield::kDelegate) {
+    OutputSuspendGenerator(generator);
+  } else {
+    DCHECK_EQ(type, Yield::kAwait);
+    OutputAwaitGenerator(generator);
+  }
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::ResumeGenerator(
     Register generator) {
   OutputResumeGenerator(generator);
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::MarkHandler(
@@ skipping 192 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