Fix compiler warning about bool conversion.

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/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 1800 matching lines @@
       value_check = ICData::New(Function::Handle(),
                                 String::Handle(),
                                 Isolate::kNoDeoptId,
                                 1);
       value_check.AddReceiverCheck(kFloat32x4Cid, Function::Handle());
       break;
     }
     default:
       // Array cids are already checked in the caller.
       UNREACHABLE();
-      return NULL;
+      return false;

[srdjan, 2013/04/29 17:06:01]

Remove return?

[Florian Schneider, 2013/04/30 08:21:11]

Done.

   }
 
   Definition* index = call->ArgumentAt(1);
   Definition* stored_value = call->ArgumentAt(2);
   if (!value_check.IsNull()) {
     AddCheckClass(stored_value, value_check, call->deopt_id(), call->env(),
                   call);
   }
   StoreBarrierType needs_store_barrier = kNoStoreBarrier;
   StoreIndexedInstr* array_op = new StoreIndexedInstr(new Value(array),
@@ skipping 3551 matching lines @@
   if (changed) {
     // We may have changed the block order and the dominator tree.
     flow_graph->DiscoverBlocks();
     GrowableArray<BitVector*> dominance_frontier;
     flow_graph->ComputeDominators(&dominance_frontier);
   }
 }
 
 
 }  // namespace dart