[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/compiler/code-assembler.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/compiler/code-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 281 matching lines @@
       return HeapConstant(Handle<HeapObject>::cast(root));
     }
   }
 
   Node* roots_array_start =
       ExternalConstant(ExternalReference::roots_array_start(isolate()));
   return Load(MachineType::AnyTagged(), roots_array_start,
               IntPtrConstant(root_index * kPointerSize));
 }
 
+Node* CodeAssembler::LoadFirstNativeContext() {
+  Node* native_contexts_list = ExternalConstant(
+      ExternalReference::native_contexts_list_address(isolate()));
+  return Load(MachineType::AnyTagged(), native_contexts_list,
+              IntPtrConstant(0));
+}
+
 Node* CodeAssembler::Store(MachineRepresentation rep, Node* base, Node* value) {
   return raw_assembler_->Store(rep, base, value, kFullWriteBarrier);
 }
 
 Node* CodeAssembler::Store(MachineRepresentation rep, Node* base, Node* index,
                            Node* value) {
   return raw_assembler_->Store(rep, base, index, value, kFullWriteBarrier);
 }
 
 Node* CodeAssembler::StoreNoWriteBarrier(MachineRepresentation rep, Node* base,
@@ skipping 867 matching lines @@
       }
     }
   }
 
   bound_ = true;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8