Remove some uses of STL map.

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/cha.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 102 matching lines @@
 
 GrowableArray<BlockEntryInstr*>* FlowGraph::CodegenBlockOrder(
     bool is_optimized) {
   return ShouldReorderBlocks(function(), is_optimized)
       ? &optimized_block_order_
       : &reverse_postorder_;
 }
 
 
 ConstantInstr* FlowGraph::GetConstant(const Object& object) {
-  ConstantInstr* constant = constant_instr_pool_.Lookup(object);
+  ConstantInstr* constant = constant_instr_pool_.LookupValue(object);
   if (constant == NULL) {
     // Otherwise, allocate and add it to the pool.
     constant = new(zone()) ConstantInstr(
         Object::ZoneHandle(zone(), object.raw()));
     constant->set_ssa_temp_index(alloc_ssa_temp_index());
 
     AddToInitialDefinitions(constant);
     constant_instr_pool_.Insert(constant);
   }
   return constant;
@@ skipping 1914 matching lines @@
         ReplaceCurrentInstruction(&it, current, replacement);
         changed = true;
       }
     }
   }
   return changed;
 }
 
 
 }  // namespace dart