[AVX-512] Unpack support in new shuffle lowering

[Chandler Carruth]

On Thu, Jan 8, 2015 at 10:11 PM, Adam Nemet <anemet at apple.com> wrote:

> The change should be obvious.  For the test, I decided to start
> resurrecting
> (and extending) avx512-shuffle.ll.  This was removed when the new shuffle
> lowering was made default.
>
> We could also add these to vector-shuffle-512-v8.ll but I think those are
> somehow generated with Chandler's fuzzer, so I decided against it.
>
> Chandler, is this reasonable?
>

My inclination would be to follow the testing structure of
vector-shuffle-512-v8.ll and extend it. Those aren't generated by my fuzzer
directly. I have a number of scripts that help generate these style of test
cases some I have mailed out (shufle_test_gen.py) but never really got
consensus on submitting (its terrible python code I'm afraid). I also have
a script that takes an existing test of the form of these shuffle tests and
re-computes the file-check portions. I can mail that out if I haven't
already.
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