Revert of [regexp] ship unicode regexps. (patchset #1 id:1 of...

Revert of [regexp] ship unicode regexps. (patchset #1 id:1 of https://codereview.chromium.org/1689113002/ )

Reason for revert:
[Sheriff] Speculative revert for gc stress failures:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20gc%20stress/builds/1726

Blamelists are screwed up currently...

Original issue's description:
> [regexp] ship unicode regexps.
>
> R=rossberg@chromium.org
> BUG=v8:2952
> LOG=N
>
> Committed: https://crrev.com/3a2fbc3a4ed2802b52659df2209b930200d63b29
> Cr-Commit-Position: refs/heads/master@{#33899}

TBR=rossberg@chromium.org,yangguo@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:2952

Review URL: https://codereview.chromium.org/1688803005

Cr-Commit-Position: refs/heads/master@{#33902}

src/flag-definitions.h

@@ -219,7 +219,8 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                   \
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind") \
-  V(harmony_species, "harmony Symbol.species")
+  V(harmony_species, "harmony Symbol.species")              \
+  V(harmony_unicode_regexps, "harmony unicode regexps")
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                               \
@@ -229,7 +230,6 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
   V(harmony_object_observe, "harmony Object.observe")                     \
   V(harmony_tostring, "harmony toString")                                 \
   V(harmony_regexps, "harmony regular expression extensions")             \
-  V(harmony_unicode_regexps, "harmony unicode regexps")                   \
   V(harmony_sloppy, "harmony features in sloppy mode")                    \
   V(harmony_sloppy_let, "harmony let in sloppy mode")                     \
   V(harmony_sloppy_function, "harmony sloppy function block scoping")     \

test/mjsunit/es6/no-unicode-regexp-flag.js

@@ -7,7 +7,7 @@
 // mjsunit/es6/regexp-flags tests that the property is there when the
 // flag is on.
 
-// Flags: --harmony-regexps --no-harmony-unicode-regexps
+// Flags: --harmony-regexp
 
 'use strict';