X64: Fix lint problem and add missing stub function.

src/ic.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 719 matching lines @@
                           Handle<Object> key) {
   if (key->IsSymbol()) {
     Handle<String> name = Handle<String>::cast(key);
 
     // If the object is undefined or null it's illegal to try to get any
     // of its properties; throw a TypeError in that case.
     if (object->IsUndefined() || object->IsNull()) {
       return TypeError("non_object_property_load", object, name);
     }
 
-    // TODO(X64): Enable specialized stubs for length and prototype lookup.
-#ifndef V8_TARGET_ARCH_X64
     if (FLAG_use_ic) {
       // Use specialized code for getting the length of strings.
       if (object->IsString() && name->Equals(Heap::length_symbol())) {
         Handle<String> string = Handle<String>::cast(object);
         Object* code = NULL;
         code = StubCache::ComputeKeyedLoadStringLength(*name, *string);
         if (code->IsFailure()) return code;
         set_target(Code::cast(code));
 #ifdef DEBUG
         TraceIC("KeyedLoadIC", name, state, target());
@@ skipping 19 matching lines @@
         Object* code =
             StubCache::ComputeKeyedLoadFunctionPrototype(*name, *function);
         if (code->IsFailure()) return code;
         set_target(Code::cast(code));
 #ifdef DEBUG
         TraceIC("KeyedLoadIC", name, state, target());
 #endif  // DEBUG
         return Accessors::FunctionGetPrototype(*object, 0);
       }
     }
-#endif  // !V8_TARGET_ARCH_X64
 
     // Check if the name is trivially convertible to an index and get
     // the element or char if so.
     uint32_t index = 0;
     if (name->AsArrayIndex(&index)) {
       HandleScope scope;
       // Rewrite to the generic keyed load stub.
       if (FLAG_use_ic) set_target(generic_stub());
       return Runtime::GetElementOrCharAt(object, index);
     }
@@ skipping 570 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal