Roll Test262

Bug: v8:6890, v8:7825, v8:7834, v8:7874
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Idc5e532977e2309de55a27ea6513301389b3a525
Reviewed-on: https://chromium-review.googlesource.com/1110120Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53934}

DEPS

@@ -58,7 +58,7 @@ deps = {
   'v8/test/mozilla/data':
     Var('chromium_url') + '/v8/deps/third_party/mozilla-tests.git' + '@' + 'f6c578a10ea707b1a8ab0b88943fe5115ce2b9be',
   'v8/test/test262/data':
-    Var('chromium_url') + '/external/github.com/tc39/test262.git' + '@' + '11f476cdbb3a4a5d39bba8e4c88b604f2cc64a21',
+    Var('chromium_url') + '/external/github.com/tc39/test262.git' + '@' + '7dc92154af01c6772b1a773e1e9fcb706b863de0',
   'v8/test/test262/harness':
     Var('chromium_url') + '/external/github.com/test262-utils/test262-harness-py.git' + '@' + '0f2acdd882c84cff43b9d60df7574a1901e2cdcd',
   'v8/tools/clang':

test/test262/testcfg.py

@@ -51,6 +51,7 @@ FEATURE_FLAGS = {
   'Symbol.matchAll': '--harmony-string-matchall',
   'numeric-separator-literal': '--harmony-numeric-separator',
   'Intl.Locale': '--harmony-locale',
+  'Symbol.prototype.description': '--harmony-symbol-description',
 }
 
 SKIPPED_FEATURES = set([])