[PATCH] [CodeGen] Combine small-element shuffles of scalar_to_vector in terms of the wider scalar.

[Ahmed Bougacha]

I'm not sure: I initially dismissed it because it works on multiple scalar inputs, for which it makes sense to do a BUILD_VECTOR directly.  For a single scalar input, I found it more straightforward to shuffle a SCALAR_TO_VECTOR, but I agree it's not very consistent.

Also, I'm not sure what happens to the BUILD_VECTOR later on, but I can imagine it being expanded to the shuffle anyway, so maybe it does make sense to do that instead.  Let me look into it!

-Ahmed


http://reviews.llvm.org/D8885

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