[regexp] Remove unused code

src/code-stubs.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/code-stubs.h"
 
 #include <sstream>
 
 #include "src/ast/ast.h"
 #include "src/bootstrapper.h"
@@ skipping 2395 matching lines @@
 
 CallInterfaceDescriptor HandlerStub::GetCallInterfaceDescriptor() const {
   if (kind() == Code::LOAD_IC || kind() == Code::KEYED_LOAD_IC) {
     return LoadWithVectorDescriptor(isolate());
   } else {
     DCHECK(kind() == Code::STORE_IC || kind() == Code::KEYED_STORE_IC);
     return StoreWithVectorDescriptor(isolate());
   }
 }
 
-
-void RegExpConstructResultStub::InitializeDescriptor(
-    CodeStubDescriptor* descriptor) {
-  descriptor->Initialize(
-      Runtime::FunctionForId(Runtime::kRegExpConstructResult)->entry);
-  descriptor->SetMissHandler(Runtime::kRegExpConstructResult);
-}
-
-
 void TransitionElementsKindStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   descriptor->Initialize(
       Runtime::FunctionForId(Runtime::kTransitionElementsKind)->entry);
 }
 
 
 void AllocateHeapNumberStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   descriptor->Initialize(
@@ skipping 891 matching lines @@
 
   if (type == MachineType::Pointer()) {
     return Representation::External();
   }
 
   return Representation::Tagged();
 }
 
 }  // namespace internal
 }  // namespace v8