Age code to allow reclaiming old unexecuted functions

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index 80988db5853b14e865cf756a3ce3b40092ae2c61..1af3074f36c48f27c0689d2753ab865f8015447b 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -62,6 +62,7 @@ MarkCompactCollector::MarkCompactCollector() :  // NOLINT
       sweep_precisely_(false),
       reduce_memory_footprint_(false),
       abort_incremental_marking_(false),
+      marking_parity_(ODD_MARKING_PARITY),
       compacting_(false),
       was_marked_incrementally_(false),
       tracer_(NULL),
@@ -404,6 +405,13 @@ void MarkCompactCollector::CollectGarbage() {
 
   Finish();
 
+  if (marking_parity_ == EVEN_MARKING_PARITY) {
+    marking_parity_ = ODD_MARKING_PARITY;
+  } else {
+    ASSERT(marking_parity_ == ODD_MARKING_PARITY);
+    marking_parity_ = EVEN_MARKING_PARITY;
+  }
+
   tracer_ = NULL;
 }
 
@@ -2397,6 +2405,16 @@ class PointersUpdatingVisitor: public ObjectVisitor {
     }
   }
 
+  void VisitCodeAgeSequence(RelocInfo* rinfo) {
+    ASSERT(RelocInfo::IsCodeAgeSequence(rinfo->rmode()));
+    Object* stub = rinfo->code_age_stub();
+    ASSERT(stub != NULL);
+    VisitPointer(&stub);
+    if (stub != rinfo->code_age_stub()) {
+      rinfo->set_code_age_stub(Code::cast(stub));
+    }
+  }
+
   void VisitDebugTarget(RelocInfo* rinfo) {
     ASSERT((RelocInfo::IsJSReturn(rinfo->rmode()) &&
             rinfo->IsPatchedReturnSequence()) ||