Add --print-flow-graph-filter to allow filtering debugging output.

runtime/vm/flow_graph_inliner.h

 // 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.
 
 #ifndef VM_FLOW_GRAPH_INLINER_H_
 #define VM_FLOW_GRAPH_INLINER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 
 namespace dart {
 
 class Field;
 class FlowGraph;
 class Function;
 
 class FlowGraphInliner : ValueObject {
  public:
   FlowGraphInliner(FlowGraph* flow_graph,
-                   GrowableArray<const Function*>* inline_id_to_function)
-      : flow_graph_(flow_graph), inline_id_to_function_(inline_id_to_function) {
-  }
+                   GrowableArray<const Function*>* inline_id_to_function);
 
   // The flow graph is destructively updated upon inlining.
   void Inline();
 
   // Compute graph info if it was not already computed or if 'force' is true.
   static void CollectGraphInfo(FlowGraph* flow_graph, bool force = false);
   static void SetInliningId(const FlowGraph& flow_graph, intptr_t inlining_id);
 
-  static bool AlwaysInline(const Function& function);
+  bool AlwaysInline(const Function& function);
 
   FlowGraph* flow_graph() const { return flow_graph_; }
   intptr_t NextInlineId(const Function& function);
 
+  bool trace_inlining() const { return trace_inlining_; }
+
  private:
   friend class CallSiteInliner;
 
   FlowGraph* flow_graph_;
   GrowableArray<const Function*>* inline_id_to_function_;
+  const bool trace_inlining_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphInliner);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_INLINER_H_