[PATCH][ARM][stage-1] Use correct scheduling type for rbit instruction

[Kyrill Tkachov]

Hi all,

This obvious patch changes the type of the rbit instruction to 'rbit' 
rather than clz.

Tested arm-none-linux-gnueabihf.

P.S. The pipeline descriptions we have handle rbit, except 
marvell-pj4.md but that one doesn't handle the current 'clz' type 
either, so it will have not have a codegen impact.

Ok for next stage 1?

Thanks,
Kyrill

2015-03-04  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/arm/arm.md (rbitsi2): Change type attr to 'rbit'.
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