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

src/regexp-macro-assembler-irregexp.h

Index: src/regexp-macro-assembler-irregexp.h
diff --git a/src/regexp-macro-assembler-irregexp.h b/src/regexp-macro-assembler-irregexp.h
index 3ddbc2fe2d0609381484ffb4de19ce3dc4121d76..6c9c2eb0903e928664c5c31dcdb3d88ab312beeb 100644
--- a/src/regexp-macro-assembler-irregexp.h
+++ b/src/regexp-macro-assembler-irregexp.h
@@ -65,6 +65,7 @@ class RegExpMacroAssemblerIrregexp: public RegExpMacroAssembler {
   virtual void PushRegister(int register_index,
                             StackCheckFlag check_stack_limit);
   virtual void AdvanceRegister(int reg, int by);  // r[reg] += by.
+  virtual void SetCurrentPositionFromEnd(int by);
   virtual void SetRegister(int register_index, int to);
   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
   virtual void ClearRegisters(int reg_from, int reg_to);