Drop the --use-processes option

[Rafael Avila de Espindola via llvm-commits]

Ccing Galina.

Rafael Avila de Espindola <rafael.espindola at gmail.com> writes:

> Lit now only supports process pools. This is a leftover from when the
> default was threads.
>
> Cheers,
> Rafael
>
> Index: buildbot/osuosl/master/config/builders.py
> ===================================================================
> --- buildbot/osuosl/master/config/builders.py	(revision 303354)
> +++ buildbot/osuosl/master/config/builders.py	(working copy)
> @@ -148,7 +148,7 @@
>                       triple="x86_64-scei-ps4",
>                       isMSVC=True,
>                       prefixCommand=None, # This is a designated builder, so no need to be nice.
> -                     extraLitArgs=["--use-processes", "-j80"])},
> +                     extraLitArgs=["-j80"])},
>  
>          {'name': "llvm-clang-x86_64-expensive-checks-win",
>           'slavenames':["ps4-buildslave2"],