Use same range info when emitting code and computing if instruction can deopt.

runtime/vm/flow_graph_type_propagator.cc

 // 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.
 
 #include "vm/flow_graph_type_propagator.h"
 
 #include "vm/cha.h"
 #include "vm/bit_vector.h"
 #include "vm/il_printer.h"
 #include "vm/object_store.h"
@@ skipping 1500 matching lines @@
   // Type is double when converted back.
   return CompileType::FromCid(kDoubleCid);
 }
 
 
 CompileType InvokeMathCFunctionInstr::ComputeType() const {
   return CompileType::FromCid(kDoubleCid);
 }
 
 
-CompileType MergedMathInstr::ComputeType() const {
+CompileType TruncDivModInstr::ComputeType() const {
   return CompileType::Dynamic();
 }
 
 
 CompileType ExtractNthOutputInstr::ComputeType() const {
   return CompileType::FromCid(definition_cid_);
 }
 
 }  // namespace dart