[PATCH] [PPC64LE] Remove unnecessary swaps from lane-insensitive vector computations

[Eric Christopher]

Seems pretty reasonable on this end. I haven't done an in-depth look at the actual optimization at this point in case Hal or someone else has.

Quick Question: The testcases with the removed xxpermdi instruction checks - not being emitted at all, emitting fewer, useless to check anyhow, something else?

-eric


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http://reviews.llvm.org/D8565

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