When reserving the requested virtual memory fails (due to address space
exhaustion), simply return nullptr to indicate allocation failure, which
callers must be prepared to handle anyway. That way, ClusterFuzz will
correctly classify OOM situations.
Bonus change: skip demo test on simulators to save time.
Drive-by cleanup: add a 'simulator_run' section to mjsunit.status

Bug: chromium:1042151,chromium:1042173
Change-Id: I8569f3c0d2a681fbf6f91b665dcb88a4ac3b901e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2002391Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65785}