More reduction of accessing TLS by caching/passing isolate value.

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 336 matching lines @@
   // Update live-in set for the given block: live-in should contain
   // all values that are live-out from the block and are not defined
   // by this block.
   // Returns true if live-in set was changed.
   bool UpdateLiveIn(const BlockEntryInstr& instr);
 
   // Perform fix-point iteration updating live-out and live-in sets
   // for blocks until they stop changing.
   void ComputeLiveInAndLiveOutSets();
 
+  Isolate* isolate() const { return isolate_; }
+
+  Isolate* isolate_;
+
   const intptr_t variable_count_;
 
   const GrowableArray<BlockEntryInstr*>& postorder_;
 
   // Live-out sets for each block.  They contain indices of variables
   // that are live out from this block: that is values that were either
   // defined in this block or live into it and that are used in some
   // successor block.
   GrowableArray<BitVector*> live_out_;
 
@@ skipping 31 matching lines @@
   // Per block sets of available blocks. Block A is available at the block B if
   // and only if A dominates B and all paths from A to B are free of side
   // effects.
   GrowableArray<BitVector*> available_at_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_H_