Support use of external strings as inputs to LoadCodeUnitsInstr.

runtime/vm/regexp_assembler.h

 // Copyright (c) 2014, 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_REGEXP_ASSEMBLER_H_
 #define VM_REGEXP_ASSEMBLER_H_
 
 #include "vm/assembler.h"
 #include "vm/intermediate_language.h"
 #include "vm/object.h"
@@ skipping 500 matching lines @@
   // is AppendInstruction, which simply appends an instruction and performs
   // bookkeeping.
   void AppendInstruction(Instruction* instruction);
   // Similar to AppendInstruction, but closes the current block by
   // setting current_instruction_ to NULL.
   void CloseBlockWith(Instruction* instruction);
   // Appends definition and allocates a temp index for the result.
   Value* Bind(Definition* definition);
   // Loads and binds a local variable.
   Value* BindLoadLocal(const LocalVariable& local);
+  Value* BindUntaggedExternalString(const LocalVariable& str);
 
   // Appends the definition.
   void Do(Definition* definition);
   // Closes the current block with a jump to the specified block.
   void GoTo(JoinEntryInstr* to);
 
   // Accessors for our local stack_.
   void PushStack(Definition* definition);
   Value* PopStack();
 
@@ skipping 89 matching lines @@
   IdAllocator temp_id_;
   IdAllocator arg_id_;
   IdAllocator local_id_;
   IdAllocator indirect_id_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_REGEXP_ASSEMBLER_H_