Remove unused/not working function tracing flag and functionality.

runtime/vm/flow_graph_inliner.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/flow_graph_inliner.h"
 
 #include "vm/compiler.h"
 #include "vm/flags.h"
 #include "vm/flow_graph.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 196 matching lines @@
     static_calls_.Clear();
     closure_calls_.Clear();
     instance_calls_.Clear();
     skip_static_call_deopt_ids_.Clear();
   }
 
   void FindCallSites(FlowGraph* graph) {
     ASSERT(graph != NULL);
     const Function& function = graph->parsed_function().function();
     ASSERT(function.HasCode());
-    const Code& code = Code::Handle(function.CurrentCode());
+    const Code& code = Code::Handle(function.unoptimized_code());
     skip_static_call_deopt_ids_.Clear();
     code.ExtractUncalledStaticCallDeoptIds(&skip_static_call_deopt_ids_);
     for (BlockIterator block_it = graph->postorder_iterator();
          !block_it.Done();
          block_it.Advance()) {
       for (ForwardInstructionIterator it(block_it.Current());
            !it.Done();
            it.Advance()) {
         it.Current()->Accept(this);
       }
@@ skipping 572 matching lines @@
         OS::Print("After Inlining of %s\n", flow_graph_->
                   parsed_function().function().ToFullyQualifiedCString());
         FlowGraphPrinter printer(*flow_graph_);
         printer.PrintBlocks();
       }
     }
   }
 }
 
 }  // namespace dart