[stubs] Factor CSA::GrowElementsCapacity() out of existing code.

src/builtins/builtins-internal.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/interface-descriptors.h"
 #include "src/macro-assembler.h"
 
 namespace v8 {
@@ skipping 90 matching lines @@
   typedef CodeStubAssembler::Label Label;
   typedef compiler::Node Node;
   typedef GrowArrayElementsDescriptor Descriptor;
 
   Node* object = assembler->Parameter(Descriptor::kObject);
   Node* key = assembler->Parameter(Descriptor::kKey);
   Node* context = assembler->Parameter(Descriptor::kContext);
 
   Label runtime(assembler, CodeStubAssembler::Label::kDeferred);
   Node* elements = assembler->LoadElements(object);
-  elements = assembler->CheckAndGrowElementsCapacity(
-      context, elements, FAST_DOUBLE_ELEMENTS, key, &runtime);
-  assembler->StoreObjectField(object, JSObject::kElementsOffset, elements);
+  elements = assembler->TryGrowElementsCapacity(
+      object, elements, FAST_DOUBLE_ELEMENTS, key, &runtime);
   assembler->Return(elements);
 
   assembler->Bind(&runtime);
   assembler->TailCallRuntime(Runtime::kGrowArrayElements, context, object, key);
 }
 
 void Builtins::Generate_GrowFastSmiOrObjectElements(
     CodeStubAssembler* assembler) {
   typedef CodeStubAssembler::Label Label;
   typedef compiler::Node Node;
   typedef GrowArrayElementsDescriptor Descriptor;
 
   Node* object = assembler->Parameter(Descriptor::kObject);
   Node* key = assembler->Parameter(Descriptor::kKey);
   Node* context = assembler->Parameter(Descriptor::kContext);
 
   Label runtime(assembler, CodeStubAssembler::Label::kDeferred);
   Node* elements = assembler->LoadElements(object);
-  elements = assembler->CheckAndGrowElementsCapacity(
-      context, elements, FAST_ELEMENTS, key, &runtime);
-  assembler->StoreObjectField(object, JSObject::kElementsOffset, elements);
+  elements = assembler->TryGrowElementsCapacity(object, elements, FAST_ELEMENTS,
+                                                key, &runtime);
   assembler->Return(elements);
 
   assembler->Bind(&runtime);
   assembler->TailCallRuntime(Runtime::kGrowArrayElements, context, object, key);
 }
 
 }  // namespace internal
 }  // namespace v8