[patch][ARM] Don't generate redundant zero_extend before smlabb

[Andrew Stubbs]

On 16/12/10 18:26, Richard Earnshaw wrote:
> This is ok to go in now.  While you're modifying these patterns, the %
> in the register constraint does not do anything useful (and actually
> makes the compiler slightly slower) since the constraints and predicates
> are otherwise identical, so it might as well be removed.
>

Thanks Richard.

I've made the adjustment, and committed the attached.

Andrew
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