[stubs] Port KeyedStoreIC_Megamorphic stub 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 1100 matching lines @@
   compiler::Node* InstanceOf(compiler::Node* object, compiler::Node* callable,
                              compiler::Node* context);
 
   // TypedArray/ArrayBuffer helpers
   compiler::Node* IsDetachedBuffer(compiler::Node* buffer);
 
   compiler::Node* ElementOffsetFromIndex(compiler::Node* index,
                                          ElementsKind kind, ParameterMode mode,
                                          int base_size = 0);
 
+ protected:
+  void HandleStoreICHandlerCase(const StoreICParameters* p,
+                                compiler::Node* handler, Label* miss);
+
  private:
   friend class CodeStubArguments;
 
   enum ElementSupport { kOnlyProperties, kSupportElements };
 
   void DescriptorLookupLinear(compiler::Node* unique_name,
                               compiler::Node* descriptors, compiler::Node* nof,
                               Label* if_found, Variable* var_name_index,
                               Label* if_not_found);
   compiler::Node* CallGetterIfAccessor(compiler::Node* value,
@@ skipping 21 matching lines @@
                                  compiler::Node* holder,
                                  Representation representation,
                                  compiler::Node* value,
                                  bool transition_to_field, Label* miss);
 
   void HandleStoreICSmiHandlerCase(compiler::Node* handler_word,
                                    compiler::Node* holder,
                                    compiler::Node* value,
                                    bool transition_to_field, Label* miss);
 
-  void HandleStoreICHandlerCase(const StoreICParameters* p,
-                                compiler::Node* handler, Label* miss);
-
   compiler::Node* TryToIntptr(compiler::Node* key, Label* miss);
   void EmitFastElementsBoundsCheck(compiler::Node* object,
                                    compiler::Node* elements,
                                    compiler::Node* intptr_index,
                                    compiler::Node* is_jsarray_condition,
                                    Label* miss);
   void EmitElementLoad(compiler::Node* object, compiler::Node* elements,
                        compiler::Node* elements_kind, compiler::Node* key,
                        compiler::Node* is_jsarray_condition, Label* if_hole,
                        Label* rebox_double, Variable* var_double_value,
@@ skipping 103 matching lines @@
   }
 #else
 #define CSA_SLOW_ASSERT(csa, x) ((void)0)
 #endif
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_