Handle contexts which have been optimized out.

runtime/vm/deopt_instructions.cc

Index: runtime/vm/deopt_instructions.cc
diff --git a/runtime/vm/deopt_instructions.cc b/runtime/vm/deopt_instructions.cc
index 45bf7082fa6a71e585a24e71573dfe15879546bf..de1e0fdeb680005bef95733b2757c3355b2c7bd3 100644
--- a/runtime/vm/deopt_instructions.cc
+++ b/runtime/vm/deopt_instructions.cc
@@ -367,7 +367,9 @@ RawArray* DeoptContext::DestFrameAsArray() {
     ASSERT(obj.IsNull() ||
            obj.IsInstance() ||
            obj.IsContext() ||
-           obj.IsTypeArguments());
+           obj.IsTypeArguments() ||
+           obj.IsClass() ||
+           obj.IsField());

[turnidge, 2014/02/13 18:55:49]

...or I could just eliminate this ASSERT entirely...

[siva, 2014/02/13 22:58:40]

Under what circumstances can we expect to see a Class object and Field object in
a dart frame? Maybe you should add a comment here
explaining that.

[turnidge, 2014/02/14 16:36:27]

I don't know why this happened yet.  I was hoping you would know :-/.

     dest_array.SetAt(i, obj);
   }
   return dest_array.raw();