Ping: Add a Scalarizer pass

[Richard Sandiford]

Ping for this update, which I think addresses all review comments so far.

Thanks,
Richard

> Remove use of TargetTransformInfo.  Do not add the pass to PassManagerBuilder.
>
> We also talked about whether to use a reverse post-order traversal,
> but I don't think it's worth it in the use cases I have.  It could
> easily be added later it we find a counterexample though.

http://llvm-reviews.chandlerc.com/D2112

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