WIP [esnext] implement async iteration proposal

src/compiler/access-builder.cc

 // Copyright 2014 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/compiler/access-builder.h"
 
 #include "src/compiler/type-cache.h"
 #include "src/contexts.h"
 #include "src/frames.h"
 #include "src/handles-inl.h"
@@ skipping 155 matching lines @@
 FieldAccess AccessBuilder::ForJSGeneratorObjectInputOrDebugPos() {
   FieldAccess access = {
       kTaggedBase,         JSGeneratorObject::kInputOrDebugPosOffset,
       Handle<Name>(),      MaybeHandle<Map>(),
       Type::NonInternal(), MachineType::AnyTagged(),
       kFullWriteBarrier};
   return access;
 }
 
 // static
+FieldAccess AccessBuilder::ForJSAsyncGeneratorObjectAwaitInput() {
+  FieldAccess access = {
+      kTaggedBase,         JSAsyncGeneratorObject::kAwaitInputOffset,
+      Handle<Name>(),      MaybeHandle<Map>(),
+      Type::NonInternal(), MachineType::AnyTagged(),
+      kFullWriteBarrier};
+  return access;
+}
+
+// static
 FieldAccess AccessBuilder::ForJSGeneratorObjectRegisterFile() {
   FieldAccess access = {
       kTaggedBase,         JSGeneratorObject::kRegisterFileOffset,
       Handle<Name>(),      MaybeHandle<Map>(),
       Type::Internal(),    MachineType::AnyTagged(),
       kPointerWriteBarrier};
   return access;
 }
 
 // static
@@ skipping 662 matching lines @@
   }
   UNREACHABLE();
   ElementAccess access = {kUntaggedBase, 0, Type::None(), MachineType::None(),
                           kNoWriteBarrier};
   return access;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8