- Skip old objects early while scavenging.

runtime/vm/scavenger.cc

Index: runtime/vm/scavenger.cc
===================================================================
--- runtime/vm/scavenger.cc	(revision 9178)
+++ runtime/vm/scavenger.cc	(working copy)
@@ -67,8 +67,10 @@
   void ScavengePointer(RawObject** p) {
     RawObject* raw_obj = *p;
 
-    // Fast exit if the raw object is a Smi.
-    if (!raw_obj->IsHeapObject()) return;
+    // Fast exit if the raw object is a Smi or an old object.
+    if (!raw_obj->IsHeapObject() || raw_obj->IsOldObject()) {
+      return;
+    }
 
     uword raw_addr = RawObject::ToAddr(raw_obj);
     // Objects should be contained in the heap.