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

[Ahmed Bougacha]

I only hit this from the SCALAR_TO_VECTOR generated by http://reviews.llvm.org/D8884.  With BUILD_VECTOR, this isn't needed after all.

Or rather, I couldn't tickle this into triggering with http://reviews.llvm.org/D8948.  Marking as abandoned, will update if I can come up with an actual testcase (the ARM one is pretty uninteresting IMO, but might be a good start).

-Ahmed


http://reviews.llvm.org/D8885

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