deps: backport 0d01728 from v8's upstream

deps: backport 0d01728 from v8's upstream

Original commit message:

    [objects] do not visit ArrayBuffer's backing store

    ArrayBuffer's backing store is a pointer to external heap, and
    can't be treated as a heap object. Doing so will result in
    crashes, when the backing store is unaligned.

    See: https://github.com/nodejs/node/issues/2791

    BUG=chromium:530531
    R=mlippautz@chromium.org
    LOG=N

    Review URL: https://codereview.chromium.org/1327403002

    Cr-Commit-Position: refs/heads/master@{#30771}

Fix: https://github.com/nodejs/node/issues/2791
PR-URL: https://github.com/nodejs/node/pull/2912
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>