deps: cherry-pick 6d38f89 from upstream V8

Original commit message:

    [turbofan] Boost performance of Array.prototype.shift by 4x.

    For small arrays, it's way faster to just move the elements instead of
    doing the fairly complex and heavy-weight left-trimming. Crankshaft has
    had this optimization for small arrays already; this CL more or less
    ports this functionality to TurboFan, which yields a 4x speed-up when
    using shift on small arrays (with up to 16 elements).

    This should recover some of the regressions reported in the Node.js issues

      https://github.com/nodejs/node/issues/12657

    and discovered for the syncthrough module using

      https://github.com/mcollina/syncthrough/blob/master/benchmarks/basic.js

    as benchmark.

    R=jarin@chromium.org
    BUG=v8:6376

    Review-Url: https://codereview.chromium.org/2874453002
    Cr-Commit-Position: refs/heads/master@{#45216}

PR-URL: https://github.com/nodejs/node/pull/13263


Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>