Do ComputeUseLists after ApplyClassIds.

runtime/vm/compiler.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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/code_generator.h"
@@ skipping 188 matching lines @@
 
       // Verify that the use lists are still valid.
       DEBUG_ASSERT(flow_graph->ValidateUseLists());
 
       // Propagate sminess from CheckSmi to phis.
       optimizer.PropagateSminess();
 
       // Use propagated class-ids to optimize further.
       optimizer.ApplyClassIds();
 
+      // Recompute use lists after applying class ids.
+      flow_graph->ComputeUseLists();
+
       // Do optimizations that depend on the propagated type information.
       // TODO(srdjan): Should this be called CanonicalizeComputations?
       optimizer.OptimizeComputations();
 
       // Unbox doubles.
       flow_graph->ComputeUseLists();
       optimizer.SelectRepresentations();
 
       if (FLAG_constant_propagation ||
           FLAG_common_subexpression_elimination) {
@@ skipping 417 matching lines @@
       Object::Handle(isolate->object_store()->sticky_error());
     isolate->object_store()->clear_sticky_error();
     isolate->set_long_jump_base(base);
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart