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

src/ic/handler-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_HANDLER_COMPILER_H_
 #define V8_IC_HANDLER_COMPILER_H_
 
 #include "src/ic/access-compiler.h"
 #include "src/ic/ic-state.h"
 
@@ skipping 187 matching lines @@
   // context we were in when this function was called. If the context
   // has changed, a jump to miss is performed. This ties the generated
   // code to a particular context and so must not be used in cases
   // where the generated code is not allowed to have references to
   // objects from a context.
   static void GenerateDirectLoadGlobalFunctionPrototype(MacroAssembler* masm,
                                                         int index,
                                                         Register prototype,
                                                         Label* miss);
 
-
-  Register scratch4() { return registers_[5]; }
+  Register scratch3() { return registers_[4]; }
 };
 
 
 class NamedStoreHandlerCompiler : public PropertyHandlerCompiler {
  public:
   explicit NamedStoreHandlerCompiler(Isolate* isolate, Handle<Map> map,
                                      Handle<JSObject> holder)
       : PropertyHandlerCompiler(isolate, Code::STORE_IC, map, holder,
                                 kCacheOnReceiver) {}
 
@@ skipping 75 matching lines @@
 
   void CompileElementHandlers(MapHandleList* receiver_maps,
                               CodeHandleList* handlers);
 
   static void GenerateStoreSlow(MacroAssembler* masm);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IC_HANDLER_COMPILER_H_