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

src/bytecodes-irregexp.h

Index: src/bytecodes-irregexp.h
diff --git a/src/bytecodes-irregexp.h b/src/bytecodes-irregexp.h
index bcb34c8992a5b858fdc511549e6fe09f69b0c432..93218ea9f16224d1258ceb29aa060cc7b7ebb267 100644
--- a/src/bytecodes-irregexp.h
+++ b/src/bytecodes-irregexp.h
@@ -88,7 +88,8 @@ V(CHECK_REGISTER_EQ_POS, 43, 8) /* bc8 reg_idx24 addr32                     */ \
 V(CHECK_AT_START,    44, 8)   /* bc8 pad24 addr32                           */ \
 V(CHECK_NOT_AT_START, 45, 8)  /* bc8 pad24 addr32                           */ \
 V(CHECK_GREEDY,      46, 8)   /* bc8 pad24 addr32                           */ \
-V(ADVANCE_CP_AND_GOTO, 47, 8) /* bc8 offset24 addr32                        */
+V(ADVANCE_CP_AND_GOTO, 47, 8) /* bc8 offset24 addr32                        */ \
+V(SET_CURRENT_POSITION_FROM_END, 48, 4) /* bc8 idx24                        */
 
 #define DECLARE_BYTECODES(name, code, length) \
   static const int BC_##name = code;