This reverts commit 88c1ae95.

Reason for revert: illegal instruction

Original change's description:
> s390x: [liftoff] implement CallRuntimeStub
>
> Change-Id: I505ea67af31006f3f233eef390f234cfc0188d6c
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2774479
> Reviewed-by: Milad Fa <mfarazma@redhat.com>
> Commit-Queue: Junliang Yan <junyan@redhat.com>
> Cr-Commit-Position: refs/heads/master@{#73525}

Change-Id: Ie464430bce6f768f38ebed193d10bbf0107a8484
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2774164Reviewed-by: Milad Fa <mfarazma@redhat.com>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73538}