- WeakProperty keys in other generations are black. Avoid trying to

vm/scavenger.cc

Index: vm/scavenger.cc
===================================================================
--- vm/scavenger.cc	(revision 13085)
+++ vm/scavenger.cc	(working copy)
@@ -499,16 +499,17 @@
                                      ScavengerVisitor* visitor) {
   // The fate of the weak property is determined by its key.
   RawObject* raw_key = raw_weak->ptr()->key_;
-  uword raw_addr = RawObject::ToAddr(raw_key);
-  uword header = *reinterpret_cast<uword*>(raw_addr);
-  if (!IsForwarding(header)) {
-    // Key is white.  Delay the weak property.
-    visitor->DelayWeakProperty(raw_weak);
-    return raw_weak->Size();
-  } else {
-    // Key is gray or black.  Make the weak property black.
-    return raw_weak->VisitPointers(visitor);
+  if (raw_key->IsHeapObject() && raw_key->IsNewObject()) {
+    uword raw_addr = RawObject::ToAddr(raw_key);
+    uword header = *reinterpret_cast<uword*>(raw_addr);
+    if (!IsForwarding(header)) {
+      // Key is white.  Delay the weak property.
+      visitor->DelayWeakProperty(raw_weak);
+      return raw_weak->Size();
+    }
   }
+  // Key is gray or black.  Make the weak property black.
+  return raw_weak->VisitPointers(visitor);
 }