[PATCH] [test] Use lit's shell test runner on Windows

[Timur Iskhodzhanov]

Any updates on this?

2013/3/21 Reid Kleckner <rnk at google.com>:
> What about something like a variable that goes in lit.site.cfg which overrides lit.cfg?
> Either way, I feel like non-bash should be the default way to run tests on Windows,
> since it's way way faster.
I think lit should support the system-native tools and approaches
whenever possible.