[cleanup] Drop handwritten KeyedStoreIC code

src/codegen.h

 // Copyright 2012 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_CODEGEN_H_
 #define V8_CODEGEN_H_
 
 #include "src/code-stubs.h"
 #include "src/globals.h"
 #include "src/runtime/runtime.h"
@@ skipping 86 matching lines @@
 typedef double (*UnaryMathFunctionWithIsolate)(double x, Isolate* isolate);
 
 UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate);
 
 V8_EXPORT_PRIVATE double modulo(double x, double y);
 
 // Custom implementation of math functions.
 double fast_sqrt(double input, Isolate* isolate);
 void lazily_initialize_fast_sqrt(Isolate* isolate);
 
-
-class ElementsTransitionGenerator : public AllStatic {
- public:
-  // If |mode| is set to DONT_TRACK_ALLOCATION_SITE,
-  // |allocation_memento_found| may be NULL.
-  static void GenerateMapChangeElementsTransition(
-      MacroAssembler* masm,
-      Register receiver,
-      Register key,
-      Register value,
-      Register target_map,
-      AllocationSiteMode mode,
-      Label* allocation_memento_found);
-  static void GenerateSmiToDouble(
-      MacroAssembler* masm,
-      Register receiver,
-      Register key,
-      Register value,
-      Register target_map,
-      AllocationSiteMode mode,
-      Label* fail);
-  static void GenerateDoubleToObject(
-      MacroAssembler* masm,
-      Register receiver,
-      Register key,
-      Register value,
-      Register target_map,
-      AllocationSiteMode mode,
-      Label* fail);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ElementsTransitionGenerator);
-};
-
-static const int kNumberDictionaryProbes = 4;
-
-
 class CodeAgingHelper {
  public:
   explicit CodeAgingHelper(Isolate* isolate);
 
   uint32_t young_sequence_length() const { return young_sequence_.length(); }
   bool IsYoung(byte* candidate) const {
     return memcmp(candidate,
                   young_sequence_.start(),
                   young_sequence_.length()) == 0;
   }
@@ skipping 11 matching lines @@
 #ifdef V8_TARGET_ARCH_ARM64
   const EmbeddedVector<byte, kNoCodeAgeSequenceLength> old_sequence_;
 #endif
 #endif
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODEGEN_H_