Avoid rediscovering blocks on each call to FlowGraph::InlineCall.

runtime/vm/intermediate_language.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_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 984 matching lines @@
     ASSERT(IsCatchEntry());
     return catch_try_index_;
   }
   void set_catch_try_index(intptr_t index) { catch_try_index_ = index; }
 
   virtual void PrepareEntry(FlowGraphCompiler* compiler);
 
   virtual void PrintTo(BufferFormatter* f) const;
 
  private:
+  friend class FlowGraph;  // Access to predecessor_ when inlining.
   virtual void ClearPredecessors() { predecessor_ = NULL; }
   virtual void AddPredecessor(BlockEntryInstr* predecessor) {
     ASSERT(predecessor_ == NULL);
     predecessor_ = predecessor;
   }
 
   BlockEntryInstr* predecessor_;
   intptr_t catch_try_index_;
 
   DISALLOW_COPY_AND_ASSIGN(TargetEntryInstr);
@@ skipping 3230 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_