VM: Separate precompilation-specific code, make flags const.

runtime/vm/redundancy_elimination.cc

 // Copyright (c) 2016, 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.
 
 #include "vm/redundancy_elimination.h"
 
 #include "vm/bit_vector.h"
 #include "vm/flow_graph.h"
 #include "vm/hash_map.h"
 #include "vm/il_printer.h"
 #include "vm/intermediate_language.h"
 #include "vm/stack_frame.h"
 
 namespace dart {
 
 
 DEFINE_FLAG(bool, dead_store_elimination, true, "Eliminate dead stores");
 DEFINE_FLAG(bool, load_cse, true, "Use redundant load elimination.");
 DEFINE_FLAG(bool, trace_load_optimization, false,
     "Print live sets for load optimization pass.");
 
 DECLARE_FLAG(bool, fields_may_be_reset);
 DECLARE_FLAG(bool, precompilation);
-DECLARE_FLAG(bool, trace_optimization);
 
 // Quick access to the current zone.
 #define Z (zone())
 
 
 class CSEInstructionMap : public ValueObject {
  public:
   // Right now CSE and LICM track a single effect: possible externalization of
   // strings.
   // Other effects like modifications of fields are tracked in a separate load
@@ skipping 3427 matching lines @@
         join->phis_ = NULL;
       } else {
         join->phis_->TruncateTo(to_index);
       }
     }
   }
 }
 
 
 }  // namespace dart