X64: Fix lint problem and add missing stub function.

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index 053a1f0a872c6738eac30451c113fd06e3b17cc9..f4d74c93541fe47907ad2fb7400642269df288e2 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -737,8 +737,6 @@ Object* KeyedLoadIC::Load(State state,
       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())) {
@@ -778,7 +776,6 @@ Object* KeyedLoadIC::Load(State state,
         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.