Revert of [es6] stage sticky regexps and RegExp.prototype.flags. (patchset #3...

Revert of [es6] stage sticky regexps and RegExp.prototype.flags. (patchset #3 id:40001 of https://codereview.chromium.org/1412133002/ )

Reason for revert:
[sheriff] breaks nosnap:
http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap/builds/4816

Original issue's description:
> [es6] stage sticky regexps and RegExp.prototype.flags.
>
> R=littledan@chromium.org
> BUG=v8:4342
> LOG=Y
>
> Committed: https://crrev.com/722719fe31fe7fd5bb50be6256b3581bb28a8169
> Cr-Commit-Position: refs/heads/master@{#31390}

TBR=littledan@chromium.org,yangguo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4342

Review URL: https://codereview.chromium.org/1403283004

Cr-Commit-Position: refs/heads/master@{#31398}

src/flag-definitions.h

@@ -190,6 +190,7 @@ DEFINE_BOOL(legacy_const, true, "legacy semantics for const in sloppy mode")
 // Features that are still work in progress (behind individual flags).
 #define HARMONY_INPROGRESS(V)                                         \
   V(harmony_modules, "harmony modules")                               \
+  V(harmony_regexps, "harmony regular expression extensions")         \
   V(harmony_proxies, "harmony proxies")                               \
   V(harmony_unicode_regexps, "harmony unicode regexps")               \
   V(harmony_tolength, "harmony ToLength")                             \
@@ -201,11 +202,10 @@ DEFINE_BOOL(legacy_const, true, "legacy semantics for const in sloppy mode")
   V(harmony_simd, "harmony simd")
 
 // Features that are complete (but still behind --harmony/es-staging flag).
-#define HARMONY_STAGED(V)                                     \
-  V(harmony_regexps, "harmony regular expression extensions") \
-  V(harmony_tostring, "harmony toString")                     \
-  V(harmony_sloppy, "harmony features in sloppy mode")        \
-  V(harmony_sloppy_let, "harmony let in sloppy mode")         \
+#define HARMONY_STAGED(V)                              \
+  V(harmony_tostring, "harmony toString")              \
+  V(harmony_sloppy, "harmony features in sloppy mode") \
+  V(harmony_sloppy_let, "harmony let in sloppy mode")  \
   V(harmony_completion, "harmony completion value semantics")
 
 // Features that are shipping (turned on by default, but internal flag remains).

test/test262/test262.status

@@ -518,13 +518,23 @@
   # https://code.google.com/p/v8/issues/detail?id=4342
   'built-ins/RegExp/prototype/exec/get-sticky-coerce': [FAIL],
   'built-ins/RegExp/prototype/exec/get-sticky-err': [FAIL],
+  'built-ins/RegExp/prototype/exec/y-fail-lastindex': [FAIL],
   'built-ins/RegExp/prototype/exec/y-fail-lastindex-no-write': [FAIL],
+  'built-ins/RegExp/prototype/exec/y-fail-return': [FAIL],
+  'built-ins/RegExp/prototype/exec/y-fail-lastindex': [FAIL],
+  'built-ins/RegExp/prototype/exec/y-init-lastindex': [FAIL],
+  'built-ins/RegExp/prototype/exec/y-set-lastindex': [FAIL],
   'built-ins/RegExp/prototype/sticky/prop-desc': [FAIL],
   'built-ins/RegExp/prototype/sticky/this-invalid-obj': [FAIL],
   'built-ins/RegExp/prototype/sticky/this-non-obj': [FAIL],
+  'built-ins/RegExp/prototype/sticky/this-regexp': [FAIL],
   'built-ins/RegExp/prototype/test/get-sticky-coerce': [FAIL],
   'built-ins/RegExp/prototype/test/get-sticky-err': [FAIL],
   'built-ins/RegExp/prototype/test/y-fail-lastindex-no-write': [FAIL],
+  'built-ins/RegExp/prototype/test/y-fail-return': [FAIL],
+  'built-ins/RegExp/prototype/test/y-fail-lastindex': [FAIL],
+  'built-ins/RegExp/prototype/test/y-init-lastindex': [FAIL],
+  'built-ins/RegExp/prototype/test/y-set-lastindex': [FAIL],
   'built-ins/RegExp/valid-flags-y': [FAIL],
 
   # https://code.google.com/p/v8/issues/detail?id=4305
@@ -561,9 +571,7 @@
   'built-ins/String/prototype/split/cstm-split-get-err': [FAIL],
 
   # https://code.google.com/p/v8/issues/detail?id=4346
-  'built-ins/RegExp/prototype/flags/name': [FAIL],
-  'built-ins/RegExp/prototype/flags/y-attr-err': [FAIL],
-  'built-ins/RegExp/prototype/flags/u': [FAIL],
+  'built-ins/RegExp/prototype/flags/*': [FAIL],
 
   # https://code.google.com/p/v8/issues/detail?id=4347
   'built-ins/RegExp/prototype/global/name': [FAIL],