Port and integrate the irregexp engine from V8

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/bit_vector.h"
 #include "vm/growable_array.h"
 #include "vm/hash_map.h"
@@ skipping 92 matching lines @@
   }
   intptr_t num_stack_locals() const {
     return num_stack_locals_;
   }
   intptr_t num_copied_params() const {
     return num_copied_params_;
   }
   intptr_t num_non_copied_params() const {
     return num_non_copied_params_;
   }
+  bool IsIrregexpFunction() const {
+    return parsed_function().function().IsIrregexpFunction();
+  }
 
   // Flow graph orders.
   const GrowableArray<BlockEntryInstr*>& preorder() const {
     return preorder_;
   }
   const GrowableArray<BlockEntryInstr*>& postorder() const {
     return postorder_;
   }
   const GrowableArray<BlockEntryInstr*>& reverse_postorder() const {
     return reverse_postorder_;
@@ skipping 363 matching lines @@
 
  private:
   GrowableArray<Definition*> defs_;
   BitVector* contains_vector_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_H_