[PATCH] [CodeGen] Combine shuffle from concat+bitcast scalar to avoid the smaller vector type.

[Ahmed Bougacha]

I have a gut feeling telling me this isn't the right solution;  let's add more of the shuffle brigade! =)

Forgive the AArch64 testcase;  on X86 there's enough heroics that we're able to recover from scalarizing the concat_vectors.  I'm a bit fuzzy on the details, so I'll definitely keep looking before committing.  In the meantime, guidance welcome!

-Ahmed


http://reviews.llvm.org/D8884

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