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

runtime/vm/regexp_assembler_bytecode.h

 // Copyright (c) 2015, 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_ASSEMBLER_BYTECODE_H_
 #define RUNTIME_VM_REGEXP_ASSEMBLER_BYTECODE_H_
 
 #include "vm/object.h"
 #include "vm/regexp_assembler.h"
 
@@ skipping 89 matching lines @@
     // extra goto.
     return true;
   }
   virtual void Print(const char* str) { UNIMPLEMENTED(); }
   virtual void PrintBlocks() { UNIMPLEMENTED(); }
   /////
 
   static RawInstance* Interpret(const RegExp& regexp,
                                 const String& str,
                                 const Smi& start_index,
+                                bool is_sticky,
                                 Zone* zone);
 
  private:
   void Expand();
   // Code and bitmap emission.
   inline void EmitOrLink(BlockLabel* label);
   inline void Emit32(uint32_t x);
   inline void Emit16(uint32_t x);
   inline void Emit8(uint32_t x);
   inline void Emit(uint32_t bc, uint32_t arg);
@@ skipping 14 matching lines @@
 
   static const int kInvalidPC = -1;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(BytecodeRegExpMacroAssembler);
 };
 
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_REGEXP_ASSEMBLER_BYTECODE_H_