Revert of Experimental support for RegExp lookbehind.

src/regexp/bytecodes-irregexp.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 #ifndef V8_REGEXP_BYTECODES_IRREGEXP_H_
 #define V8_REGEXP_BYTECODES_IRREGEXP_H_
 
 namespace v8 {
 namespace internal {
@@ skipping 39 matching lines @@
 V(AND_CHECK_NOT_4_CHARS, 29, 16) /* bc8 pad24 uint32 uint32 addr32          */ \
 V(AND_CHECK_NOT_CHAR, 30, 12) /* bc8 pad8 uint16 uint32 addr32              */ \
 V(MINUS_AND_CHECK_NOT_CHAR, 31, 12) /* bc8 pad8 uc16 uc16 uc16 addr32       */ \
 V(CHECK_CHAR_IN_RANGE, 32, 12) /* bc8 pad24 uc16 uc16 addr32                */ \
 V(CHECK_CHAR_NOT_IN_RANGE, 33, 12) /* bc8 pad24 uc16 uc16 addr32            */ \
 V(CHECK_BIT_IN_TABLE, 34, 24) /* bc8 pad24 addr32 bits128                   */ \
 V(CHECK_LT,          35, 8)   /* bc8 pad8 uc16 addr32                       */ \
 V(CHECK_GT,          36, 8)   /* bc8 pad8 uc16 addr32                       */ \
 V(CHECK_NOT_BACK_REF, 37, 8)  /* bc8 reg_idx24 addr32                       */ \
 V(CHECK_NOT_BACK_REF_NO_CASE, 38, 8) /* bc8 reg_idx24 addr32                */ \
-V(CHECK_NOT_BACK_REF_BACKWARD, 39, 8)         /* bc8 reg_idx24 addr32       */ \
-V(CHECK_NOT_BACK_REF_NO_CASE_BACKWARD, 40, 8) /* bc8 reg_idx24 addr32       */ \
-V(CHECK_NOT_REGS_EQUAL, 41, 12) /* bc8 regidx24 reg_idx32 addr32            */ \
-V(CHECK_REGISTER_LT, 42, 12)  /* bc8 reg_idx24 value32 addr32               */ \
-V(CHECK_REGISTER_GE, 43, 12)  /* bc8 reg_idx24 value32 addr32               */ \
-V(CHECK_REGISTER_EQ_POS, 44, 8) /* bc8 reg_idx24 addr32                     */ \
-V(CHECK_AT_START,    45, 8)   /* bc8 pad24 addr32                           */ \
-V(CHECK_NOT_AT_START, 46, 8)  /* bc8 offset24 addr32                        */ \
-V(CHECK_GREEDY,      47, 8)   /* bc8 pad24 addr32                           */ \
-V(ADVANCE_CP_AND_GOTO, 48, 8) /* bc8 offset24 addr32                        */ \
-V(SET_CURRENT_POSITION_FROM_END, 49, 4) /* bc8 idx24                        */
+V(CHECK_NOT_REGS_EQUAL, 39, 12) /* bc8 regidx24 reg_idx32 addr32            */ \
+V(CHECK_REGISTER_LT, 40, 12)  /* bc8 reg_idx24 value32 addr32               */ \
+V(CHECK_REGISTER_GE, 41, 12)  /* bc8 reg_idx24 value32 addr32               */ \
+V(CHECK_REGISTER_EQ_POS, 42, 8) /* bc8 reg_idx24 addr32                     */ \
+V(CHECK_AT_START,    43, 8)   /* bc8 pad24 addr32                           */ \
+V(CHECK_NOT_AT_START, 44, 8)  /* bc8 pad24 addr32                           */ \
+V(CHECK_GREEDY,      45, 8)   /* bc8 pad24 addr32                           */ \
+V(ADVANCE_CP_AND_GOTO, 46, 8) /* bc8 offset24 addr32                        */ \
+V(SET_CURRENT_POSITION_FROM_END, 47, 4) /* bc8 idx24                        */
 
 #define DECLARE_BYTECODES(name, code, length) \
   static const int BC_##name = code;
 BYTECODE_ITERATOR(DECLARE_BYTECODES)
 #undef DECLARE_BYTECODES
 
 #define DECLARE_BYTECODE_LENGTH(name, code, length) \
   static const int BC_##name##_LENGTH = length;
 BYTECODE_ITERATOR(DECLARE_BYTECODE_LENGTH)
 #undef DECLARE_BYTECODE_LENGTH
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REGEXP_BYTECODES_IRREGEXP_H_