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

runtime/vm/flow_graph.cc

 // 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.
 
 #include "vm/flow_graph.h"
 
 #include "vm/bit_vector.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
 #include "vm/flow_graph_range_analysis.h"
 #include "vm/il_printer.h"
 #include "vm/intermediate_language.h"
 #include "vm/growable_array.h"
 #include "vm/object_store.h"
 #include "vm/report.h"
 
 namespace dart {
 
 #if defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_IA32)
 DEFINE_FLAG(bool, trace_smi_widening, false, "Trace Smi->Int32 widening pass.");
 #endif
 DEFINE_FLAG(bool, prune_dead_locals, true, "optimize dead locals away");
 DECLARE_FLAG(bool, emit_edge_counters);
 DECLARE_FLAG(bool, reorder_basic_blocks);
-DECLARE_FLAG(bool, trace_optimization);
 DECLARE_FLAG(bool, verify_compiler);
 
 
 FlowGraph::FlowGraph(const ParsedFunction& parsed_function,
                      GraphEntryInstr* graph_entry,
                      intptr_t max_block_id)
   : thread_(Thread::Current()),
     parent_(),
     current_ssa_temp_index_(0),
     max_block_id_(max_block_id),
@@ skipping 1958 matching lines @@
         ReplaceCurrentInstruction(&it, current, replacement);
         changed = true;
       }
     }
   }
   return changed;
 }
 
 
 }  // namespace dart