[turbofan] Restore basic write barrier elimination.

src/compiler/js-native-context-specialization.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/js-native-context-specialization.h"
 
 #include "src/accessors.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
@@ skipping 261 matching lines @@
       if (access_mode == AccessMode::kLoad &&
           access_info.holder().ToHandle(&holder)) {
         this_receiver = jsgraph()->Constant(holder);
       }
       Node* this_storage = this_receiver;
       if (!field_index.is_inobject()) {
         this_storage = this_effect = graph()->NewNode(
             simplified()->LoadField(AccessBuilder::ForJSObjectProperties()),
             this_storage, this_effect, this_control);
       }
-      FieldAccess field_access = {kTaggedBase, field_index.offset(), name,
-                                  field_type, MachineType::AnyTagged()};
+      FieldAccess field_access = {
+          kTaggedBase, field_index.offset(),     name,
+          field_type,  MachineType::AnyTagged(), kFullWriteBarrier};
       if (access_mode == AccessMode::kLoad) {
         if (field_type->Is(Type::UntaggedFloat64())) {
           if (!field_index.is_inobject() || field_index.is_hidden_field() ||
               !FLAG_unbox_double_fields) {
             this_storage = this_effect =
                 graph()->NewNode(simplified()->LoadField(field_access),
                                  this_storage, this_effect, this_control);
             field_access.offset = HeapNumber::kValueOffset;
             field_access.name = MaybeHandle<Name>();
           }
@@ skipping 422 matching lines @@
     // Compute the element access.
     Type* element_type = Type::Any();
     MachineType element_machine_type = MachineType::AnyTagged();
     if (IsFastDoubleElementsKind(elements_kind)) {
       element_type = Type::Number();
       element_machine_type = MachineType::Float64();
     } else if (IsFastSmiElementsKind(elements_kind)) {
       element_type = type_cache_.kSmi;
     }
     ElementAccess element_access = {kTaggedBase, FixedArray::kHeaderSize,
-                                    element_type, element_machine_type};
+                                    element_type, element_machine_type,
+                                    kFullWriteBarrier};
 
     // Access the actual element.
     // TODO(bmeurer): Refactor this into separate methods or even a separate
     // class that deals with the elements access.
     if (access_mode == AccessMode::kLoad) {
       // Compute the real element access type, which includes the hole in case
       // of holey backing stores.
       if (elements_kind == FAST_HOLEY_ELEMENTS ||
           elements_kind == FAST_HOLEY_SMI_ELEMENTS) {
         element_access.type = Type::Union(
@@ skipping 291 matching lines @@
 }
 
 
 SimplifiedOperatorBuilder* JSNativeContextSpecialization::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8