[llvm] r227809 - Fix ARM peephole optimizeCompare to avoid optimizing unsigned cmp to 0.

[Hans Wennborg]

On Mon, Feb 2, 2015 at 8:56 AM, Jan Wen Voung <jvoung at google.com> wrote:
> Author: jvoung
> Date: Mon Feb  2 10:56:50 2015
> New Revision: 227809
>
> URL: http://llvm.org/viewvc/llvm-project?rev=227809&view=rev
> Log:
> Fix ARM peephole optimizeCompare to avoid optimizing unsigned cmp to 0.
>
> Summary:
> Previously it only avoided optimizing signed comparisons to 0.
> Sometimes the DAGCombiner will optimize the unsigned comparisons
> to 0 before it gets to the peephole pass, but sometimes it doesn't.
>
> Fix for PR22373.

Renato: I think we want this for 3.6. Does it look ok to you?

 - Hans