Make accessors for oddball objects return Oddball* instead of Object*.

src/hydrogen.cc

Index: src/hydrogen.cc
===================================================================
--- src/hydrogen.cc	(revision 9511)
+++ src/hydrogen.cc	(working copy)
@@ -4667,7 +4667,8 @@
   ASSERT(target_shared->has_deoptimization_support());
   TypeFeedbackOracle target_oracle(
       Handle<Code>(target_shared->code()),
-      Handle<Context>(target->context()->global_context()));
+      Handle<Context>(target->context()->global_context()),
+      isolate());
   FunctionState target_state(this, &target_info, &target_oracle);
 
   HConstant* undefined = graph()->GetConstantUndefined();