[patch][lit] Make it compatible with python 3 (but drop python 2.5)

[Justin Bogner]

So David Majnemer actually changed this from the "as" syntax to the ","
syntax in r223626 in order to keep our compatibility claim. I think we
need to make sure everyone's okay with upping our minimum python to 2.6
before we can commit this.

That said, I'm in favour of upping the minimum python as long as it
doesn't break anyone.

Dan Albert <danalbert at google.com> writes:
> LGTM unless anyone knows of a platform holding us to 2.5.
>
> On Thu, Dec 11, 2014 at 9:50 AM, Rafael Espíndola <rafael.espindola at gmail.com>
> wrote:
>
>     The attached patch makes the internal lit runner work on python 3, but
>     I am told it breaks compatibility with python 2.5.
>    
>     Is that OK. Is there some document that needs to be update to say we
>     need 2.6 now?
>    
>     Cheers,
>     Rafael