Enable optimizer pipeline for DBC.

runtime/vm/flow_graph_allocator.h

 // Copyright (c) 2013, 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_FLOW_GRAPH_ALLOCATOR_H_
 #define VM_FLOW_GRAPH_ALLOCATOR_H_
 
 #include "vm/flow_graph.h"
 #include "vm/growable_array.h"
 #include "vm/intermediate_language.h"
@@ skipping 280 matching lines @@
   // List of spilled live ranges.
   GrowableArray<LiveRange*> spilled_;
 
   // List of instructions containing calls.
   GrowableArray<Instruction*> safepoints_;
 
   Location::Kind register_kind_;
 
   intptr_t number_of_registers_;
 
+#if defined(TARGET_ARCH_DBC)
+  intptr_t last_used_register_;
+#endif
+
   // Per register lists of allocated live ranges.  Contain only those
   // ranges that can be affected by future allocation decisions.
   // Those live ranges that end before the start of the current live range are
   // removed from the list and will not be affected.
   // The length of both arrays is 'number_of_registers_'
   GrowableArray<ZoneGrowableArray<LiveRange*>*> registers_;
 
   GrowableArray<bool> blocked_registers_;
 
 
@@ skipping 361 matching lines @@
 
   AllocationFinger finger_;
 
   DISALLOW_COPY_AND_ASSIGN(LiveRange);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_ALLOCATOR_H_