[stubs] Port KeyedLoadSloppyArgumentsStub and KeyedStoreSloppyArgumentsStub to TurboFan.

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 6678938ecfe03fb357aec5aec12f338e8d85d951..1f5008cd74ee4e7f5a8609dfe0cf462dbf39a9c1 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -637,6 +637,20 @@ class CodeStubAssembler : public compiler::CodeAssembler {
                        Representation representation, compiler::Node* value,
                        bool transition_to_field);
 
+  // Emits keyed sloppy arguments load. Returns either the loaded value.
+  compiler::Node* LoadKeyedSloppyArguments(compiler::Node* receiver,
+                                           compiler::Node* key,
+                                           Label* bailout) {
+    return EmitKeyedSloppyArguments(receiver, key, nullptr, bailout);
+  }
+
+  // Emits keyed sloppy arguments store.
+  void StoreKeyedSloppyArguments(compiler::Node* receiver, compiler::Node* key,
+                                 compiler::Node* value, Label* bailout) {
+    DCHECK_NOT_NULL(value);
+    EmitKeyedSloppyArguments(receiver, key, value, bailout);
+  }
+
   void LoadIC(const LoadICParameters* p);
   void LoadGlobalIC(const LoadICParameters* p);
   void KeyedLoadIC(const LoadICParameters* p);
@@ -701,6 +715,13 @@ class CodeStubAssembler : public compiler::CodeAssembler {
 
   compiler::Node* SmiShiftBitsConstant();
 
+  // 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);
+
   static const int kElementLoopUnrollThreshold = 8;
 };