Limit end-anchored regexps to testing end of string where possible.

src/regexp-macro-assembler.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 137 matching lines @@
   virtual void PopCurrentPosition() = 0;
   virtual void PopRegister(int register_index) = 0;
   // Pushes the label on the backtrack stack, so that a following Backtrack
   // will go to this label. Always checks the backtrack stack limit.
   virtual void PushBacktrack(Label* label) = 0;
   virtual void PushCurrentPosition() = 0;
   virtual void PushRegister(int register_index,
                             StackCheckFlag check_stack_limit) = 0;
   virtual void ReadCurrentPositionFromRegister(int reg) = 0;
   virtual void ReadStackPointerFromRegister(int reg) = 0;
+  virtual void SetCurrentPositionFromEnd(int by) = 0;
   virtual void SetRegister(int register_index, int to) = 0;
   virtual void Succeed() = 0;
   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset) = 0;
   virtual void ClearRegisters(int reg_from, int reg_to) = 0;
   virtual void WriteStackPointerToRegister(int reg) = 0;
 };
 
 
 #ifndef V8_INTERPRETED_REGEXP  // Avoid compiling unused code.
 
@@ skipping 53 matching lines @@
                         const byte* input_start,
                         const byte* input_end,
                         int* output);
 };
 
 #endif  // V8_INTERPRETED_REGEXP
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGEXP_MACRO_ASSEMBLER_H_