Ensure objects emitted in code are allocated in old space.

runtime/vm/intermediate_language.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 318 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(UseVal);
 };
 
 
 class ConstantVal: public Value {
  public:
   explicit ConstantVal(const Object& value)
       : value_(value) {
     ASSERT(value.IsZoneHandle());
+    ASSERT(value.IsSmi() || value.IsOld());
   }
 
   DECLARE_VALUE(Constant)
 
   const Object& value() const { return value_; }
 
  private:
   const Object& value_;
 
   DISALLOW_COPY_AND_ASSIGN(ConstantVal);
@@ skipping 2140 matching lines @@
   const GrowableArray<BlockEntryInstr*>& block_order_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_