ArraySpliceTorque builtin triggers generation of MIPS specific
trampolines due to its large size, and this code is not PIC
and cannot be isolate independent.

This CL is a workaround that marks ArraySpliceTorque as
isolate dependent on MIPS64.

Bug: v8:7882
Change-Id: I0b5764236268c2529e149b275dcf382dab709682
Reviewed-on: https://chromium-review.googlesource.com/1111847
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53968}