[PATCH] Fix wrong encoding of MRSBanked.

[Charlie Turner]

>>! In D6448#8, @t.p.northover wrote:
> Hi Charlie,
> 
> This looks fine to me. Thanks for spotting it!
> 
> Tim.

Thanks for the review Tim :) -- committed as r222920.

Patch by Matthew Wahab, forgot to mention that at the start.

Best,
Charlie.

http://reviews.llvm.org/D6448