Drop TODO that no longer applies after refactoring.

src/runtime/runtime.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/v8.h"
 
 #include "src/runtime/runtime.h"
 #include "src/runtime/runtime-utils.h"
 
 namespace v8 {
 namespace internal {
 
 // Header of runtime functions.
 #define F(name, number_of_args, result_size)                    \
   Object* Runtime_##name(int args_length, Object** args_object, \
                          Isolate* isolate);
 
 #define P(name, number_of_args, result_size)                       \
   ObjectPair Runtime_##name(int args_length, Object** args_object, \
                             Isolate* isolate);
 
 // Reference implementation for inlined runtime functions.  Only used when the
 // compiler does not support a certain intrinsic.  Don't optimize these, but
 // implement the intrinsic in the respective compiler instead.
-// TODO(mstarzinger): These are place-holder stubs for TurboFan and will
-// eventually all have a C++ implementation and this macro will be gone.
 #define I(name, number_of_args, result_size)                             \
   Object* RuntimeReference_##name(int args_length, Object** args_object, \
                                   Isolate* isolate);
 
 RUNTIME_FUNCTION_LIST_RETURN_OBJECT(F)
 RUNTIME_FUNCTION_LIST_RETURN_PAIR(P)
 INLINE_OPTIMIZED_FUNCTION_LIST(F)
 INLINE_FUNCTION_LIST(I)
 
 #undef I
@@ skipping 76 matching lines @@
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 
 std::ostream& operator<<(std::ostream& os, Runtime::FunctionId id) {
   return os << Runtime::FunctionForId(id)->name;
 }
 
 }  // namespace internal
 }  // namespace v8