[Heap] Remove concept of MarkingParity.

src/builtins/arm64/builtins-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 1539 matching lines @@
     __ CallCFunction(
         ExternalReference::get_make_code_young_function(masm->isolate()), 2);
     __ Pop(lr, fp, x3, x1, x0);
   }
 
   // The calling function has been made young again, so return to execute the
   // real frame set-up code.
   __ Br(x0);
 }
 
-#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
 
 void Builtins::Generate_MarkCodeAsExecutedOnce(MacroAssembler* masm) {
   // For now, as in GenerateMakeCodeYoungAgainCommon, we are relying on the fact
   // that make_code_young doesn't do any garbage collection which allows us to
   // save/restore the registers without worrying about which of them contain
   // pointers.
 
@@ skipping 1389 matching lines @@
     __ Unreachable();
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM