[PATCH] Implement the vpopcnt instructions for POWER8

[Kit Barton]

I realized this afternoon that this patch conflicts slightly with a patch Nemanja put in next week. Specifically, the FeatureP8Altivec needs to be added in a slightly different place now. This doesn't change the behaviour of the patch in any way, just a slight change in the location of the update.


http://reviews.llvm.org/D7270

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