WIP [esnext] implement async iteration proposal

src/interpreter/bytecode-array-builder.h

 // 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.
 
 #ifndef V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 
 #include "src/ast/ast.h"
 #include "src/base/compiler-specific.h"
 #include "src/globals.h"
@@ skipping 297 matching lines @@
   // Complex flow control.
   BytecodeArrayBuilder& ForInPrepare(Register receiver,
                                      RegisterList cache_info_triple);
   BytecodeArrayBuilder& ForInContinue(Register index, Register cache_length);
   BytecodeArrayBuilder& ForInNext(Register receiver, Register index,
                                   RegisterList cache_type_array_pair,
                                   int feedback_slot);
   BytecodeArrayBuilder& ForInStep(Register index);
 
   // Generators.
-  BytecodeArrayBuilder& SuspendGenerator(Register generator);
+  BytecodeArrayBuilder& SuspendGenerator(
+      Register generator, Yield::YieldType type = Yield::kNormal);
   BytecodeArrayBuilder& ResumeGenerator(Register generator);
 
   // Exception handling.
   BytecodeArrayBuilder& MarkHandler(int handler_id,
                                     HandlerTable::CatchPrediction will_catch);
   BytecodeArrayBuilder& MarkTryBegin(int handler_id, Register context);
   BytecodeArrayBuilder& MarkTryEnd(int handler_id);
 
   // Creates a new handler table entry and returns a {hander_id} identifying the
   // entry, so that it can be referenced by above exception handling support.
@@ skipping 110 matching lines @@
   static int const kNoFeedbackSlot = 0;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeArrayBuilder);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_