Cleanup access to guarded_fields

runtime/vm/flow_graph.h

Index: runtime/vm/flow_graph.h
diff --git a/runtime/vm/flow_graph.h b/runtime/vm/flow_graph.h
index 5ca3d0f2ab1981e083e40bbfbc6ad581efe2cb63..d4d9d2fa8e4b4b057fa12c80ca50662390728ade 100644
--- a/runtime/vm/flow_graph.h
+++ b/runtime/vm/flow_graph.h
@@ -277,14 +277,8 @@ class FlowGraph : public ZoneAllocated {
 
   bool IsCompiledForOsr() const { return graph_entry()->IsCompiledForOsr(); }
 
-  static void AddToGuardedFields(ZoneGrowableArray<const Field*>* array,
-                                 const Field* field);
   void AddToDeferredPrefixes(ZoneGrowableArray<const LibraryPrefix*>* from);
 
-  ZoneGrowableArray<const Field*>* guarded_fields() const {
-    return guarded_fields_;
-  }
-
   ZoneGrowableArray<const LibraryPrefix*>* deferred_prefixes() const {
     return deferred_prefixes_;
   }
@@ -386,7 +380,6 @@ class FlowGraph : public ZoneAllocated {
 
   ZoneGrowableArray<BlockEntryInstr*>* loop_headers_;
   ZoneGrowableArray<BitVector*>* loop_invariant_loads_;
-  ZoneGrowableArray<const Field*>* guarded_fields_;
   ZoneGrowableArray<const LibraryPrefix*>* deferred_prefixes_;
   DirectChainedHashMap<ConstantPoolTrait> constant_instr_pool_;
   BitVector* captured_parameters_;