Restore r20998 with a bug fix: add field to guarded_fields_ when it contains relevant cid. Was miss…

runtime/vm/flow_graph.h

 // 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.
 
 #ifndef VM_FLOW_GRAPH_H_
 #define VM_FLOW_GRAPH_H_
 
 #include "vm/growable_array.h"
 #include "vm/intermediate_language.h"
 #include "vm/parser.h"
@@ skipping 123 matching lines @@
   // TODO(zerny): Once the SSA is feature complete this should be removed.
   void Bailout(const char* reason) const;
 
   void InvalidateDominatorTree() { invalid_dominator_tree_ = true; }
 
 #ifdef DEBUG
   // Verification methods for debugging.
   bool VerifyUseLists();
 #endif  // DEBUG
 
-  // Return all instance fields that are loaded in the graph and
-  // have non-generic type feedback attached to them that can
-  // potentially affect optimizations.
-  const ZoneGrowableArray<Field*>* FieldDependencies() const;
-
  private:
   friend class BranchSimplifier;
   friend class ConstantPropagator;
 
   void DiscoverBlocks();
 
   // SSA transformation methods and fields.
   void ComputeDominators(GrowableArray<BitVector*>* dominance_frontier);
 
   void CompressPath(
@@ skipping 36 matching lines @@
   GrowableArray<BlockEntryInstr*> preorder_;
   GrowableArray<BlockEntryInstr*> postorder_;
   GrowableArray<BlockEntryInstr*> reverse_postorder_;
   bool invalid_dominator_tree_;
   ConstantInstr* constant_null_;
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_H_