IR refactoring: consolidate all boxing and unboxing instructions.

runtime/vm/flow_graph_compiler.h

 // 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.
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #define VM_FLOW_GRAPH_COMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/code_descriptors.h"
@@ skipping 455 matching lines @@
   void FinalizeStackmaps(const Code& code);
   void FinalizeVarDescriptors(const Code& code);
   void FinalizeStaticCallTargetsTable(const Code& code);
 
   const Class& double_class() const { return double_class_; }
   const Class& mint_class() const { return mint_class_; }
   const Class& float32x4_class() const { return float32x4_class_; }
   const Class& float64x2_class() const { return float64x2_class_; }
   const Class& int32x4_class() const { return int32x4_class_; }
 
+  const Class& BoxClassFor(Representation rep);
+
   void SaveLiveRegisters(LocationSummary* locs);
   void RestoreLiveRegisters(LocationSummary* locs);
 
   Environment* SlowPathEnvironmentFor(Instruction* instruction);
 
   intptr_t CurrentTryIndex() const {
     if (current_block_ == NULL) {
       return CatchClauseNode::kInvalidTryIndex;
     }
     return current_block_->try_index();
@@ skipping 178 matching lines @@
   intptr_t lazy_deopt_pc_offset_;
 
   ZoneGrowableArray<const ICData*>* deopt_id_to_ic_data_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_H_