Support use of external strings as inputs to LoadCodeUnitsInstr.

runtime/vm/symbols.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_SYMBOLS_H_
 #define VM_SYMBOLS_H_
 
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
 
@@ skipping 329 matching lines @@
   V(current_character, ":current_character")                                   \
   V(current_position, ":current_position")                                     \
   V(string_param_length, ":string_param_length")                               \
   V(capture_length, ":capture_length")                                         \
   V(word_character_map, ":word_character_map")                                 \
   V(match_start_index, ":match_start_index")                                   \
   V(capture_start_index, ":capture_start_index")                               \
   V(match_end_index, ":match_end_index")                                       \
   V(char_in_capture, ":char_in_capture")                                       \
   V(char_in_match, ":char_in_match")                                           \
+  V(index_temp, ":index_temp")                                                 \
   V(result, ":result")                                                         \
   V(position_registers, ":position_registers")                                 \
   V(string_param, ":string_param")                                             \
   V(start_index_param, ":start_index_param")                                   \
   V(clear, "clear")                                                            \
   V(_wordCharacterMap, "_wordCharacterMap")                                    \
   V(print, "print")                                                            \
   V(last, "last")                                                              \
   V(removeLast, "removeLast")                                                  \
   V(add, "add")                                                                \
@@ skipping 198 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_