[patch][pr22947] Use sext in fast isel

[Rafael Espíndola]

On 6 April 2015 at 18:17, Eric Christopher <echristo at gmail.com> wrote:
> Definitely more of what I had in mind on the IR. I'd suggest a comment
> saying what the code generation in the testcases means (at least over the
> first one).
>
> Might want to cc one of the mips guys as a follow up to the commit to make
> sure that they're happy with it. I believe this is what they want to be
> actually testing, but there's a chance I'm wrong :)

Committed as r234249.

CCing the original author of the test.

Cheers,
Rafael