Add alias disambiguation for VM fields.

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/intermediate_language.h"
 #include "vm/os.h"
 #include "vm/parser.h"
 
@@ skipping 475 matching lines @@
     f->Print(", ");
     PushArgumentAt(i)->value()->PrintTo(f);
   }
 }
 
 
 void MaterializeObjectInstr::PrintOperandsTo(BufferFormatter* f) const {
   f->Print("%s", String::Handle(cls_.Name()).ToCString());
   for (intptr_t i = 0; i < InputCount(); i++) {
     f->Print(", ");
-    f->Print("%s: ", String::Handle(fields_[i]->name()).ToCString());
+    f->Print("%s: ", fields_[i]->ToCString());
     InputAt(i)->PrintTo(f);
   }
 }
 
 
 void CreateArrayInstr::PrintOperandsTo(BufferFormatter* f) const {
   for (int i = 0; i < ArgumentCount(); ++i) {
     if (i != 0) f->Print(", ");
     PushArgumentAt(i)->value()->PrintTo(f);
   }
@@ skipping 460 matching lines @@
       f->Print(" [");
       locations_[i].PrintTo(f);
       f->Print("]");
     }
   }
   f->Print(" }");
   if (outer_ != NULL) outer_->PrintTo(f);
 }
 
 }  // namespace dart