deps: cherry-pick r21466 from v8 trunk

Check for cached transition to ExternalArray elements kind.
See [1] and [2] for details.

[1] https://code.google.com/p/v8/issues/detail?id=3337
[2] https://codereview.chromium.org/291193011



Signed-off-by: Fedor Indutny <fedor@indutny.com>