Make LoadIndexedInstr for Uint32List use kUnboxedUint32 representation

runtime/vm/flow_graph_optimizer.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_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/cpu.h"
 #include "vm/dart_entry.h"
@@ skipping 610 matching lines @@
 
   Definition* converted = NULL;
   if ((from == kTagged) && (to == kUnboxedMint)) {
     ASSERT((deopt_target != NULL) ||
            (use->Type()->ToCid() == kUnboxedMint));
     const intptr_t deopt_id = (deopt_target != NULL) ?
         deopt_target->DeoptimizationTarget() : Isolate::kNoDeoptId;
     converted = new(I) UnboxIntegerInstr(use->CopyWithType(), deopt_id);
   } else if ((from == kUnboxedMint) && (to == kTagged)) {
     converted = new(I) BoxIntegerInstr(use->CopyWithType());
+  } else if ((from == kUnboxedUint32) && (to == kTagged)) {
+    converted = new(I) BoxUint32Instr(use->CopyWithType());
   } else if (IsUnboxedInteger(from) && IsUnboxedInteger(to)) {
     const intptr_t deopt_id = (to == kUnboxedInt32) && (deopt_target != NULL) ?
         deopt_target->DeoptimizationTarget() : Isolate::kNoDeoptId;
     converted = new(I) UnboxedIntConverterInstr(from,
                                                 to,
                                                 use->CopyWithType(),
                                                 deopt_id);
   } else if ((from == kUnboxedInt32) && (to == kUnboxedDouble)) {
     converted = new Int32ToDoubleInstr(use->CopyWithType());
   } else if ((from == kTagged) && (to == kUnboxedInt32)) {
@@ skipping 9479 matching lines @@
 
   // Insert materializations at environment uses.
   for (intptr_t i = 0; i < exits_collector_.exits().length(); i++) {
     CreateMaterializationAt(
         exits_collector_.exits()[i], alloc, alloc->cls(), *slots);
   }
 }
 
 
 }  // namespace dart