Integrate the Irregexp Regular Expression Engine.

runtime/vm/growable_array.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.
 // Defines growable array classes, that differ where they are allocated:
 // - GrowableArray: allocated on stack.
 // - ZoneGrowableArray: allocated in the zone.
 
 #ifndef VM_GROWABLE_ARRAY_H_
 #define VM_GROWABLE_ARRAY_H_
 
@@ skipping 42 matching lines @@
     return result;
   }
 
   T& operator[](intptr_t index) const {
     ASSERT(0 <= index);
     ASSERT(index < length_);
     ASSERT(length_ <= capacity_);
     return data_[index];
   }
 
+  const T& At(intptr_t index) const {
+    return operator[](index);
+  }
+
   T& Last() const {
     ASSERT(length_ > 0);
     return operator[](length_ - 1);
   }
 
   void AddArray(const BaseGrowableArray<T, B>& src) {
     for (intptr_t i = 0; i < src.length(); i++) {
       Add(src[i]);
     }
   }
@@ skipping 88 matching lines @@
           initial_capacity,
           Isolate::Current()->current_zone()) {}
   ZoneGrowableArray() :
       BaseGrowableArray<T, ZoneAllocated>(
           Isolate::Current()->current_zone()) {}
 };
 
 }  // namespace dart
 
 #endif  // VM_GROWABLE_ARRAY_H_