[stubs] Port CreateWeakCellStub to turbofan

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index 19cdfb7d5c79e32e72948b625fc561a1ab22b8d8..02d88e4c3f49b7152f0ea34a02964718c28da7b5 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -542,37 +542,6 @@ Handle<Code> FastCloneShallowArrayStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
-
-template <>
-HValue* CodeStubGraphBuilder<CreateWeakCellStub>::BuildCodeStub() {
-  // This stub is performance sensitive, the generated code must be tuned
-  // so that it doesn't build an eager frame.
-  info()->MarkMustNotHaveEagerFrame();
-
-  HValue* size = Add<HConstant>(WeakCell::kSize);
-  HInstruction* object =
-      Add<HAllocate>(size, HType::JSObject(), TENURED, JS_OBJECT_TYPE,
-                     graph()->GetConstant0());
-
-  Handle<Map> weak_cell_map = isolate()->factory()->weak_cell_map();
-  AddStoreMapConstant(object, weak_cell_map);
-
-  HInstruction* value = GetParameter(Descriptor::kValue);
-  Add<HStoreNamedField>(object, HObjectAccess::ForWeakCellValue(), value);
-  Add<HStoreNamedField>(object, HObjectAccess::ForWeakCellNext(),
-                        graph()->GetConstantHole());
-
-  HInstruction* feedback_vector = GetParameter(Descriptor::kVector);
-  HInstruction* slot = GetParameter(Descriptor::kSlot);
-  Add<HStoreKeyed>(feedback_vector, slot, object, nullptr, FAST_ELEMENTS,
-                   INITIALIZING_STORE);
-  return graph()->GetConstant0();
-}
-
-
-Handle<Code> CreateWeakCellStub::GenerateCode() { return DoGenerateCode(this); }
-
-
 template <>
 HValue* CodeStubGraphBuilder<LoadScriptContextFieldStub>::BuildCodeStub() {
   int context_index = casted_stub()->context_index();