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

[Ahmed Bougacha]

In http://reviews.llvm.org/D8885#153343, @RKSimon wrote:

> If you look at the early versions of the patch on http://reviews.llvm.org/D8516 we did have a version that would create a SCALAR_TO_VECTOR if only the first scalar was defined, but there wasn't a good use case for it so it got dropped. Readding that path should be trivial.


I don't think we need that after all;  I agree with your comment there that it's fine to "rely on a target's lowering logic to do the right thing."

-Ahmed


http://reviews.llvm.org/D8885

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