WIP [esnext] implement async iteration proposal

src/builtins/builtins-array.cc

 // Copyright 2016 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/builtins/builtins.h"
 #include "src/builtins/builtins-utils.h"
 
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/contexts.h"
@@ skipping 2264 matching lines @@
   typedef compiler::Node Node;
   typedef CodeStubAssembler::Label Label;
   typedef CodeStubAssembler::Variable Variable;
   CodeStubAssembler assembler(state);
 
   Handle<String> operation = assembler.factory()->NewStringFromAsciiChecked(
       "Array Iterator.prototype.next", TENURED);
 
   Node* iterator = assembler.Parameter(0);
   Node* context = assembler.Parameter(3);
-
   Variable var_value(&assembler, MachineRepresentation::kTagged);
   Variable var_done(&assembler, MachineRepresentation::kTagged);
 
   // Required, or else `throw_bad_receiver` fails a DCHECK due to these
   // variables not being bound along all paths, despite not being used.
   var_done.Bind(assembler.TrueConstant());
   var_value.Bind(assembler.UndefinedConstant());
 
   Label throw_bad_receiver(&assembler, Label::kDeferred);
   Label set_done(&assembler);
@@ skipping 450 matching lines @@
     Node* message = assembler.SmiConstant(MessageTemplate::kDetachedOperation);
     Node* result =
         assembler.CallRuntime(Runtime::kThrowTypeError, context, message,
                               assembler.HeapConstant(operation));
     assembler.Return(result);
   }
 }
 
 }  // namespace internal
 }  // namespace v8