This CL changes the ArrayPrototypeShift builtin to a CSA macro which
is used in a newly created Torque builtin.

This is in preparation for removing the JavaScript fall-back, which
will be replaced by a baseline Torque implementation.

R=cbruni@chromium.org, jgruber@chromium.org

Bug: v8:7624
Change-Id: I9b7898beea2802cc02d394e040a1e500387cf108
Reviewed-on: https://chromium-review.googlesource.com/1169172Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@google.com>
Cr-Commit-Position: refs/heads/master@{#55036}