[cleanup] Drop unused scratch register from {load,store}_calling_convention

src/ic/access-compiler.h

 // Copyright 2014 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_IC_ACCESS_COMPILER_H_
 #define V8_IC_ACCESS_COMPILER_H_
 
 #include "src/code-stubs.h"
 #include "src/macro-assembler.h"
 #include "src/objects.h"
@@ skipping 40 matching lines @@
   Isolate* isolate() const { return isolate_; }
   Heap* heap() const { return isolate()->heap(); }
   Factory* factory() const { return isolate()->factory(); }
 
   Register receiver() const { return registers_[0]; }
   Register name() const { return registers_[1]; }
   Register slot() const;
   Register vector() const;
   Register scratch1() const { return registers_[2]; }
   Register scratch2() const { return registers_[3]; }
-  Register scratch3() const { return registers_[4]; }
 
   static Register* GetCallingConvention(Code::Kind);
   static Register* load_calling_convention();
   static Register* store_calling_convention();
   static Register* keyed_store_calling_convention();
 
   Register* registers_;
 
   static void GenerateTailCall(MacroAssembler* masm, Handle<Code> code);
 
   Handle<Code> GetCodeWithFlags(Code::Flags flags, const char* name);
   Handle<Code> GetCodeWithFlags(Code::Flags flags, Handle<Name> name);
 
  private:
   Code::Kind kind_;
   CacheHolderFlag cache_holder_;
 
   Isolate* isolate_;
   MacroAssembler masm_;
   // Ensure that MacroAssembler has a reasonable size.
   STATIC_ASSERT(sizeof(MacroAssembler) < 128 * kPointerSize);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IC_ACCESS_COMPILER_H_