- Speculative change for Dartium bots.

runtime/vm/scavenger.cc

Index: runtime/vm/scavenger.cc
diff --git a/runtime/vm/scavenger.cc b/runtime/vm/scavenger.cc
index 15f4c535f2004a5da2f5d51d496322ca7dc1e8a1..caf0d51d9d5bb68db3abdfccb14f2529b65e450c 100644
--- a/runtime/vm/scavenger.cc
+++ b/runtime/vm/scavenger.cc
@@ -159,6 +159,9 @@ class ScavengerVisitor : public ObjectPointerVisitor {
 
     uword raw_addr = RawObject::ToAddr(raw_obj);
     // The scavenger is only interested in objects located in the from space.
+    if (scavenger_->to_->Contains(raw_addr)) {
+      return;
+    }
     ASSERT(from_->Contains(raw_addr));
     // Read the header word of the object and determine if the object has
     // already been copied.