[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..cd66959bf941b6217e032c2fc3118b6238db6df4 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -637,6 +637,13 @@ class CodeStubAssembler : public compiler::CodeAssembler {
                        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);