Add fast 64-bit integer ADD and SUB to the optimizing compiler.

runtime/vm/flow_graph_allocator.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_allocator.h"
 
 #include "vm/bit_vector.h"
 #include "vm/intermediate_language.h"
 #include "vm/il_printer.h"
 #include "vm/flow_graph.h"
@@ skipping 2151 matching lines @@
          instr_it.Advance()) {
       Instruction* instr = instr_it.Current();
       if (instr->IsDefinition() && instr->representation() == kUnboxedMint) {
         mint_values_->Add(instr->AsDefinition()->ssa_temp_index());
       }
     }
   }
 }
 
 
-
 void FlowGraphAllocator::AllocateRegisters() {
   CollectRepresentations();
 
   EliminateEnvironmentUses();
 
   AnalyzeLiveness();
 
   NumberInstructions();
 
   DiscoverLoops();
@@ skipping 55 matching lines @@
     OS::Print("-- [after ssa allocator] ir [%s] -------------\n",
               function.ToFullyQualifiedCString());
     FlowGraphPrinter printer(flow_graph_, true);
     printer.PrintBlocks();
     OS::Print("----------------------------------------------\n");
   }
 }
 
 
 }  // namespace dart