[turbofan] Disable the intl/overrides/string test.

This test times out with Turbo Fan enabled. See issue 3526 for details.

BUG=
R=ulan@chromium.org, wingo@igalia.com

Review URL: https://codereview.chromium.org/494173002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23297 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/intl/intl.status

@@ -43,5 +43,8 @@
   'date-format/parse-mdyhms': [FAIL],
   'number-format/parse-decimal': [FAIL],
   'number-format/parse-percent': [FAIL],
+
+  # TODO(jbramley): This test times out with TurboFan. See issue 3526.
+  'overrides/string': [PASS, NO_VARIANTS],
 }],  # ALWAYS
 ]