Use off-heap data for class check instructions

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 450 matching lines @@
             name.ToCString(), cls.ToCString());
       }
       thread()->cha()->AddToGuardedClasses(cls, subclass_count);
       return false;
     }
   }
   return true;
 }
 
 
+Instruction* FlowGraph::CreateCheckClass(Definition* to_check,
+                                         const Cids& cids,
+                                         intptr_t deopt_id,
+                                         TokenPosition token_pos) {
+  if (cids.IsMonomorphic() && cids.MonomorphicReceiverCid() == kSmiCid) {
+    return new (zone())
+        CheckSmiInstr(new (zone()) Value(to_check), deopt_id, token_pos);
+  }
+  return new (zone())
+      CheckClassInstr(new (zone()) Value(to_check), deopt_id, cids, token_pos);
+}
+
+
 bool FlowGraph::VerifyUseLists() {
   // Verify the initial definitions.
   for (intptr_t i = 0; i < graph_entry_->initial_definitions()->length(); ++i) {
     VerifyUseListsInInstruction((*graph_entry_->initial_definitions())[i]);
   }
 
   // Verify phis in join entries and the instructions in each block.
   for (intptr_t i = 0; i < preorder_.length(); ++i) {
     BlockEntryInstr* entry = preorder_[i];
     JoinEntryInstr* join = entry->AsJoinEntry();
@@ skipping 1818 matching lines @@
                                                 Representation rep,
                                                 intptr_t cid) {
   ExtractNthOutputInstr* extract =
       new (Z) ExtractNthOutputInstr(new (Z) Value(instr), index, rep, cid);
   instr->ReplaceUsesWith(extract);
   InsertAfter(instr, extract, NULL, FlowGraph::kValue);
 }
 
 
 }  // namespace dart