[Heap] Remove concept of MarkingParity.

src/ppc/codegen-ppc.cc

 // Copyright 2014 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/ppc/codegen-ppc.h"
 
 #if V8_TARGET_ARCH_PPC
 
 #include <memory>
 
@@ skipping 177 matching lines @@
 }
 #endif
 
 
 bool Code::IsYoungSequence(Isolate* isolate, byte* sequence) {
   bool result = isolate->code_aging_helper()->IsYoung(sequence);
   DCHECK(result || isolate->code_aging_helper()->IsOld(sequence));
   return result;
 }
 
-
-void Code::GetCodeAgeAndParity(Isolate* isolate, byte* sequence, Age* age,
-                               MarkingParity* parity) {
+Code::Age Code::GetCodeAge(Isolate* isolate, byte* sequence) {
   if (IsYoungSequence(isolate, sequence)) {
-    *age = kNoAgeCodeAge;
-    *parity = NO_MARKING_PARITY;
+    return kNoAgeCodeAge;
   } else {
     Code* code = NULL;
     Address target_address =
         Assembler::target_address_at(sequence + kCodeAgingTargetDelta, code);
     Code* stub = GetCodeFromTargetAddress(target_address);
-    GetCodeAgeAndParity(stub, age, parity);
+    return GetAgeOfCodeAgeStub(stub);
   }
 }
 
-
-void Code::PatchPlatformCodeAge(Isolate* isolate, byte* sequence, Code::Age age,
-                                MarkingParity parity) {
+void Code::PatchPlatformCodeAge(Isolate* isolate, byte* sequence,
+                                Code::Age age) {
   uint32_t young_length = isolate->code_aging_helper()->young_sequence_length();
   if (age == kNoAgeCodeAge) {
     isolate->code_aging_helper()->CopyYoungSequenceTo(sequence);
     Assembler::FlushICache(isolate, sequence, young_length);
   } else {
     // FIXED_SEQUENCE
-    Code* stub = GetCodeAgeStub(isolate, age, parity);
+    Code* stub = GetCodeAgeStub(isolate, age);
     CodePatcher patcher(isolate, sequence,
                         young_length / Assembler::kInstrSize);
     Assembler::BlockTrampolinePoolScope block_trampoline_pool(patcher.masm());
     intptr_t target = reinterpret_cast<intptr_t>(stub->instruction_start());
     // Don't use Call -- we need to preserve ip and lr.
     // GenerateMakeCodeYoungAgainCommon for the stub code.
     patcher.masm()->nop();  // marker to detect sequence (see IsOld)
     patcher.masm()->mov(r3, Operand(target));
     patcher.masm()->Jump(r3);
     for (int i = 0; i < kCodeAgingSequenceNops; i++) {
       patcher.masm()->nop();
     }
   }
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC