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

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index 46d74b6b2f4e52f463c96b36458a0250f607d3db..1b65dd05edd45c8c7581019baa6e79136336152b 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -3154,32 +3154,6 @@ Handle<Code> KeyedLoadStubCompiler::CompileLoadArrayLength(
 }
 
 
-Handle<Code> KeyedLoadStubCompiler::CompileLoadStringLength(
-    Handle<String> name) {
-  // ----------- S t a t e -------------
-  //  -- rax    : key
-  //  -- rdx    : receiver
-  //  -- rsp[0] : return address
-  // -----------------------------------
-  Label miss;
-
-  Counters* counters = isolate()->counters();
-  __ IncrementCounter(counters->keyed_load_string_length(), 1);
-
-  // Check that the name has not changed.
-  __ Cmp(rax, name);
-  __ j(not_equal, &miss);
-
-  GenerateLoadStringLength(masm(), rdx, rcx, rbx, &miss, true);
-  __ bind(&miss);
-  __ DecrementCounter(counters->keyed_load_string_length(), 1);
-  GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC);
-
-  // Return the generated code.
-  return GetCode(Code::CALLBACKS, name);
-}
-
-
 Handle<Code> KeyedLoadStubCompiler::CompileLoadFunctionPrototype(
     Handle<String> name) {
   // ----------- S t a t e -------------