[Heap] Remove concept of MarkingParity.

src/builtins/x64/builtins-x64.cc

Index: src/builtins/x64/builtins-x64.cc
diff --git a/src/builtins/x64/builtins-x64.cc b/src/builtins/x64/builtins-x64.cc
index 35aeea636e843509b66712d1db9ecd7cbb56d15f..75b51642345cf423c41633bc7f9fa2cfe271e971 100644
--- a/src/builtins/x64/builtins-x64.cc
+++ b/src/builtins/x64/builtins-x64.cc
@@ -1202,14 +1202,9 @@ static void GenerateMakeCodeYoungAgainCommon(MacroAssembler* masm) {
   __ ret(0);
 }
 
-#define DEFINE_CODE_AGE_BUILTIN_GENERATOR(C)                  \
-  void Builtins::Generate_Make##C##CodeYoungAgainEvenMarking( \
-      MacroAssembler* masm) {                                 \
-    GenerateMakeCodeYoungAgainCommon(masm);                   \
-  }                                                           \
-  void Builtins::Generate_Make##C##CodeYoungAgainOddMarking(  \
-      MacroAssembler* masm) {                                 \
-    GenerateMakeCodeYoungAgainCommon(masm);                   \
+#define DEFINE_CODE_AGE_BUILTIN_GENERATOR(C)                              \
+  void Builtins::Generate_Make##C##CodeYoungAgain(MacroAssembler* masm) { \
+    GenerateMakeCodeYoungAgainCommon(masm);                               \
   }
 CODE_AGE_LIST(DEFINE_CODE_AGE_BUILTIN_GENERATOR)
 #undef DEFINE_CODE_AGE_BUILTIN_GENERATOR