Eliminate redundant descriptor ElementTransitionAndStoreDescriptor.

src/x64/interface-descriptors-x64.cc

 // 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/interface-descriptors.h"
 
@@ skipping 29 matching lines @@
 const Register LoadGlobalViaContextDescriptor::SlotRegister() { return rbx; }
 const Register LoadGlobalViaContextDescriptor::NameRegister() { return rcx; }
 
 
 const Register StoreGlobalViaContextDescriptor::DepthRegister() { return rdx; }
 const Register StoreGlobalViaContextDescriptor::SlotRegister() { return rbx; }
 const Register StoreGlobalViaContextDescriptor::NameRegister() { return rcx; }
 const Register StoreGlobalViaContextDescriptor::ValueRegister() { return rax; }
 
 
-const Register ElementTransitionAndStoreDescriptor::MapRegister() {
-  return rbx;
-}
-
-
 const Register InstanceofDescriptor::left() { return rax; }
 const Register InstanceofDescriptor::right() { return rdx; }
 
 
 const Register ArgumentsAccessReadDescriptor::index() { return rdx; }
 const Register ArgumentsAccessReadDescriptor::parameter_count() { return rax; }
 
 
 const Register ApiGetterDescriptor::function_address() { return r8; }
 
@@ skipping 294 matching lines @@
       rdi,  // math rounding function
       rdx,  // vector slot id
       rbx   // type vector
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64