Since liftoff is turned on upon debugger.enable, these tests need to be
skipped.

Change-Id: Icaa02ffb77d0bbcb24b2c232e519c0547e714a24
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2062940Reviewed-by: Milad Farazmand <miladfar@ca.ibm.com>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#66335}