This CL adds the --assert-types flag to d8, which is intended to
insert additional runtime checks after typed nodes, verifying the
validity of our typing rules. So far, only range types are checked.

Thanks to Neil Patil for suggesting something similar.

R=neis@chromium.org, tebbi@chromium.org

Change-Id: I5eb2c482235ec8cd07ee802ca7c12c86c2d3dc40
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1678372
Commit-Queue: Georg Schmid <gsps@google.com>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62664}