[stubs] Port KeyedLoadSloppyArgumentsStub and KeyedStoreSloppyArgumentsStub to TurboFan.

src/code-stub-assembler.h

 // 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.
 
 #ifndef V8_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 619 matching lines @@
                          Variable* var_handler, Label* if_miss);
 
   compiler::Node* PrepareValueForWrite(compiler::Node* value,
                                        Representation representation,
                                        Label* bailout);
 
   void StoreNamedField(compiler::Node* object, FieldIndex index,
                        Representation representation, compiler::Node* value,
                        bool transition_to_field);
 
+  // Emits keyed sloppy arguments load if the |value| is nullptr or store
+  // otherwise. Returns either the loaded value or |value|.
+  compiler::Node* EmitKeyedSloppyArguments(compiler::Node* receiver,
+                                           compiler::Node* key,
+                                           compiler::Node* value,
+                                           Label* bailout);
+
   void LoadIC(const LoadICParameters* p);
   void LoadGlobalIC(const LoadICParameters* p);
   void KeyedLoadIC(const LoadICParameters* p);
   void KeyedLoadICGeneric(const LoadICParameters* p);
 
   // Get the enumerable length from |map| and return the result as a Smi.
   compiler::Node* EnumLength(compiler::Node* map);
 
   // Check the cache validity for |receiver|. Branch to |use_cache| if
   // the cache is valid, otherwise branch to |use_runtime|.
@@ skipping 52 matching lines @@
   compiler::Node* SmiShiftBitsConstant();
 
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_