Add wkdev-setup-debugging host script

[TingPing]

patrick@wkdev:~/checkout/WebKit$ rr record echo 'hello world'
rr needs /proc/sys/kernel/perf_event_paranoid <= 1, but it is 2.
Change it to 1, or use 'rr record -n' (slow).
Consider putting 'kernel.perf_event_paranoid = 1' in /etc/sysctl.d/10-rr.conf.
See 'man 8 sysctl', 'man 5 sysctl.d' (systemd systems)
and 'man 5 sysctl.conf' (non-systemd systems) for more details.

[nikolaszimmermann]

I'm not sure anymore if we really need this. rr is actually nice and explains what you need to do on your host system.
How about we just add a README.md section for tools like rr/perf/etc. and describe with a few sentences what needs to be done on the host -- there are so many host distros, that handle things differently, probably hard to script it.

[fred-wang]

FWIW, this is https://github.com/rr-debugger/rr/wiki/Building-And-Installing#os-configuration