Use off-heap data for class check instructions

runtime/vm/flow_graph.h

 // Copyright (c) 2013, 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 RUNTIME_VM_FLOW_GRAPH_H_
 #define RUNTIME_VM_FLOW_GRAPH_H_
 
 #include "vm/bit_vector.h"
 #include "vm/growable_array.h"
 #include "vm/hash_map.h"
@@ skipping 115 matching lines @@
   BlockIterator postorder_iterator() const {
     return BlockIterator(postorder());
   }
 
   void EnsureSSATempIndex(Definition* defn, Definition* replacement);
 
   void ReplaceCurrentInstruction(ForwardInstructionIterator* iterator,
                                  Instruction* current,
                                  Instruction* replacement);
 
+  Instruction* CreateCheckClass(Definition* to_check,
+                                const Cids& cids,
+                                intptr_t deopt_id,
+                                TokenPosition token_pos);
+
   intptr_t current_ssa_temp_index() const { return current_ssa_temp_index_; }
   void set_current_ssa_temp_index(intptr_t index) {
     current_ssa_temp_index_ = index;
   }
 
   intptr_t max_virtual_register_number() const {
     return current_ssa_temp_index();
   }
 
   bool InstanceCallNeedsClassCheck(InstanceCallInstr* call,
@@ skipping 410 matching lines @@
 
  private:
   GrowableArray<Definition*> defs_;
   BitVector* contains_vector_;
 };
 
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_FLOW_GRAPH_H_