Revert of [es6] ship regexp sticky flag.

src/flag-definitions.h

 // Copyright 2012 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.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 198 matching lines @@
   V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")               \
   V(harmony_simd, "harmony simd")                                         \
   V(harmony_do_expressions, "harmony do-expressions")                     \
   V(harmony_regexp_subclass, "harmony regexp subclassing")                \
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind")
 
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                                 \
   V(harmony_destructuring_assignment, "harmony destructuring assignment") \
   V(harmony_sloppy, "harmony features in sloppy mode")                    \
-  V(harmony_sloppy_let, "harmony let in sloppy mode")
+  V(harmony_sloppy_let, "harmony let in sloppy mode")                     \
+  V(harmony_regexps, "harmony regular expression extensions")
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                   \
   V(harmony_default_parameters, "harmony default parameters") \
   V(harmony_destructuring_bind, "harmony destructuring bind") \
   V(harmony_concat_spreadable, "harmony isConcatSpreadable")  \
   V(harmony_object_observe, "harmony Object.observe")         \
   V(harmony_tolength, "harmony ToLength")                     \
   V(harmony_tostring, "harmony toString")                     \
-  V(harmony_completion, "harmony completion value semantics") \
-  V(harmony_regexps, "harmony regular expression extensions")
+  V(harmony_completion, "harmony completion value semantics")
+
 
 // Once a shipping feature has proved stable in the wild, it will be dropped
 // from HARMONY_SHIPPING, all occurrences of the FLAG_ variable are removed,
 // and associated tests are moved from the harmony directory to the appropriate
 // esN directory.
 
 
 #define FLAG_INPROGRESS_FEATURES(id, description) \
   DEFINE_BOOL(id, false, "enable " #description " (in progress)")
 HARMONY_INPROGRESS(FLAG_INPROGRESS_FEATURES)
@@ skipping 894 matching lines @@
 #undef DEFINE_ALIAS_FLOAT
 #undef DEFINE_ALIAS_ARGS
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA