Remove extraneous forced rejuvenations in code aging

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/11421219

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13125 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler.cc

@@ -618,7 +618,6 @@ Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
     if (result->ic_age() != HEAP->global_ic_age()) {
       result->ResetForNewContext(HEAP->global_ic_age());
     }
-    result->code()->MakeYoung();
   }
 
   if (result.is_null()) isolate->ReportPendingMessages();
@@ -680,7 +679,6 @@ Handle<SharedFunctionInfo> Compiler::CompileEval(Handle<String> source,
     if (result->ic_age() != HEAP->global_ic_age()) {
       result->ResetForNewContext(HEAP->global_ic_age());
     }
-    result->code()->MakeYoung();
   }
 
   return result;

src/flag-definitions.h

@@ -400,7 +400,7 @@ DEFINE_bool(flush_code, true,
             "flush code that we expect not to use again (during full gc)")
 DEFINE_bool(flush_code_incrementally, true,
             "flush code that we expect not to use again (incrementally)")
-DEFINE_bool(age_code, false,
+DEFINE_bool(age_code, true,
             "track un-executed functions to age code and flush only "
             "old code")
 DEFINE_bool(incremental_marking, true, "use incremental marking")

src/objects.cc

@@ -7972,7 +7972,6 @@ void SharedFunctionInfo::InstallFromOptimizedCodeMap(JSFunction* function,
   ASSERT(code != NULL);
   ASSERT(function->context()->native_context() == code_map->get(index - 1));
   function->ReplaceCode(code);
-  code->MakeYoung();
 }
 
 
@@ -8841,14 +8840,6 @@ void Code::MakeCodeAgeSequenceYoung(byte* sequence) {
 }
 
 
-void Code::MakeYoung() {
-  byte* sequence = FindCodeAgeSequence();
-  if (sequence != NULL) {
-    PatchPlatformCodeAge(sequence, kNoAge, NO_MARKING_PARITY);
-  }
-}
-
-
 void Code::MakeOlder(MarkingParity current_parity) {
   byte* sequence = FindCodeAgeSequence();
   if (sequence != NULL) {

src/objects.h

@@ -4573,7 +4573,6 @@ class Code: public HeapObject {
 
   // Code aging
   static void MakeCodeAgeSequenceYoung(byte* sequence);
-  void MakeYoung();
   void MakeOlder(MarkingParity);
   static bool IsYoungSequence(byte* sequence);
   bool IsOld();