Add code age subtype tracking to --track-gc-object-stats

src/mips/codegen-mips.cc

Index: src/mips/codegen-mips.cc
diff --git a/src/mips/codegen-mips.cc b/src/mips/codegen-mips.cc
index fb250fafeb51270c5edefdd2b9dabbac5ae54102..ec6649533fc73eaed5b91b0fa89b2aeb18a2e4e3 100644
--- a/src/mips/codegen-mips.cc
+++ b/src/mips/codegen-mips.cc
@@ -638,7 +638,7 @@ bool Code::IsYoungSequence(byte* sequence) {
 void Code::GetCodeAgeAndParity(byte* sequence, Age* age,
                                MarkingParity* parity) {
   if (IsYoungSequence(sequence)) {
-    *age = kNoAge;
+    *age = kNoAgeCodeAge;
     *parity = NO_MARKING_PARITY;
   } else {
     Address target_address = Memory::Address_at(
@@ -655,7 +655,7 @@ void Code::PatchPlatformCodeAge(Isolate* isolate,
                                 MarkingParity parity) {
   uint32_t young_length;
   byte* young_sequence = GetNoCodeAgeSequence(&young_length);
-  if (age == kNoAge) {
+  if (age == kNoAgeCodeAge) {
     CopyBytes(sequence, young_sequence, young_length);
     CPU::FlushICache(sequence, young_length);
   } else {