VM: Optimize RegExp.matchAsPrefix(...) by generating a sticky RegExp specialization.

runtime/vm/regexp.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 RUNTIME_VM_REGEXP_H_
 #define RUNTIME_VM_REGEXP_H_
 
 #include "vm/assembler.h"
 #include "vm/intermediate_language.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 1380 matching lines @@
   };
 
   static CompilationResult CompileIR(
       RegExpCompileData* input,
       const ParsedFunction* parsed_function,
       const ZoneGrowableArray<const ICData*>& ic_data_array);
 
   static CompilationResult CompileBytecode(RegExpCompileData* data,
                                            const RegExp& regexp,
                                            bool is_one_byte,
+                                           bool sticky,
                                            Zone* zone);
 
   static RawRegExp* CreateRegExp(Thread* thread,
                                  const String& pattern,
                                  bool multi_line,
                                  bool ignore_case);
 
   static void DotPrint(const char* label, RegExpNode* node, bool ignore_case);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_REGEXP_H_