Replace special IC builtins and stubs in the map's cache by codestubs.

src/stub-cache.h

Index: src/stub-cache.h
diff --git a/src/stub-cache.h b/src/stub-cache.h
index c562bc714c8c124641c1265bbd08952ab58aaffa..555d66076052ef75d2b9741fc2699ecfc7fc894c 100644
--- a/src/stub-cache.h
+++ b/src/stub-cache.h
@@ -136,9 +136,6 @@ class StubCache {
   Handle<Code> ComputeKeyedLoadArrayLength(Handle<String> name,
                                            Handle<JSArray> receiver);
 
-  Handle<Code> ComputeKeyedLoadStringLength(Handle<String> name,
-                                            Handle<String> receiver);
-
   Handle<Code> ComputeKeyedLoadFunctionPrototype(Handle<String> name,
                                                  Handle<JSFunction> receiver);
 
@@ -672,8 +669,6 @@ class KeyedLoadStubCompiler: public StubCompiler {
 
   Handle<Code> CompileLoadArrayLength(Handle<String> name);
 
-  Handle<Code> CompileLoadStringLength(Handle<String> name);
-
   Handle<Code> CompileLoadFunctionPrototype(Handle<String> name);
 
   Handle<Code> CompileLoadElement(Handle<Map> receiver_map);