VM: Fix crash bug in constant propagation.

runtime/vm/il_printer.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/il_printer.h"
 
 #include "vm/flow_graph_range_analysis.h"
 #include "vm/intermediate_language.h"
 #include "vm/os.h"
 #include "vm/parser.h"
@@ skipping 219 matching lines @@
   PrintICDataHelper(&f, ic_data);
   THR_Print("%s ", buffer);
   const Array& a = Array::Handle(ic_data.arguments_descriptor());
   THR_Print(" arg-desc %" Pd "\n", a.Length());
 }
 
 
 static void PrintUse(BufferFormatter* f, const Definition& definition) {
   if (definition.HasSSATemp()) {
     if (definition.HasPairRepresentation()) {
-      f->Print("v%" Pd ", v%" Pd "", definition.ssa_temp_index(),
-                                     definition.ssa_temp_index() + 1);
+      f->Print("(v%" Pd ", v%" Pd ")", definition.ssa_temp_index(),
+                                       definition.ssa_temp_index() + 1);
     } else {
       f->Print("v%" Pd "", definition.ssa_temp_index());
     }
   } else if (definition.HasTemp()) {
     f->Print("t%" Pd "", definition.temp_index());
   }
 }
 
 
 const char* Instruction::ToCString() const {
@@ skipping 960 matching lines @@
 }
 
 const char* Environment::ToCString() const {
   char buffer[1024];
   BufferFormatter bf(buffer, 1024);
   PrintTo(&bf);
   return Thread::Current()->zone()->MakeCopyOfString(buffer);
 }
 
 }  // namespace dart