Use Function::ZoneHandle for StaticCallInstr targets

runtime/vm/aot_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/aot_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/branch_optimizer.h"
 #include "vm/cha.h"
 #include "vm/compiler.h"
@@ skipping 2005 matching lines @@
 }
 
 
 void AotOptimizer::VisitPolymorphicInstanceCall(
     PolymorphicInstanceCallInstr* call) {
   const intptr_t receiver_cid =
       call->PushArgumentAt(0)->value()->Type()->ToCid();
   if (receiver_cid != kDynamicCid) {
     const Class& receiver_class =
         Class::Handle(Z, isolate()->class_table()->At(receiver_cid));
-    const Function& function = Function::Handle(
+    const Function& function = Function::ZoneHandle(
         Z, call->instance_call()->ResolveForReceiverClass(receiver_class));
     if (!function.IsNull()) {
       // Only one target. Replace by static call.
       StaticCallInstr* new_call = StaticCallInstr::FromCall(Z, call, function);
       call->ReplaceWith(new_call, current_iterator());
     }
   }
 }
 
 
@@ skipping 161 matching lines @@
                                   FlowGraph::kEffect);
         current_iterator()->RemoveCurrentFromGraph();
       }
     }
   }
 }
 
 #endif  // DART_PRECOMPILER
 
 }  // namespace dart