[Heap] Remove concept of MarkingParity.

src/builtins/builtins.h

 // Copyright 2011 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.
 
 #ifndef V8_BUILTINS_BUILTINS_H_
 #define V8_BUILTINS_BUILTINS_H_
 
 #include "src/base/flags.h"
 #include "src/handles.h"
 
@@ skipping 11 matching lines @@
 
 #define CODE_AGE_LIST(V) CODE_AGE_LIST_WITH_ARG(CODE_AGE_LIST_IGNORE_ARG, V)
 
 #define CODE_AGE_LIST_COMPLETE(V) \
   V(ToBeExecutedOnce)             \
   V(NotExecuted)                  \
   V(ExecutedOnce)                 \
   V(NoAge)                        \
   CODE_AGE_LIST_WITH_ARG(CODE_AGE_LIST_IGNORE_ARG, V)
 
-#define DECLARE_CODE_AGE_BUILTIN(C, V) \
-  V(Make##C##CodeYoungAgainOddMarking) \
-  V(Make##C##CodeYoungAgainEvenMarking)
+#define DECLARE_CODE_AGE_BUILTIN(C, V) V(Make##C##CodeYoungAgain)
 
 // CPP: Builtin in C++. Entered via BUILTIN_EXIT frame.
 //      Args: name
 // API: Builtin in C++ for API callbacks. Entered via EXIT frame.
 //      Args: name
 // TFJ: Builtin in Turbofan, with JS linkage (callable as Javascript function).
 //      Args: name, arguments count
 // TFS: Builtin in Turbofan, with CodeStub linkage.
 //      Args: name, code kind, extra IC state, interface descriptor
 // ASM: Builtin in platform-dependent assembly.
@@ skipping 793 matching lines @@
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_BUILTINS_H_