Ping: Add a Scalarizer pass

[Richard Sandiford]

Pekka Jääskeläinen <pekka.jaaskelainen at tut.fi> writes:
> LGTM.
>
> IMHO this could be committed to the 3.4 branch as it's not part
> of the default pass chain.

Thanks Pekka.  Nadav, since you had comments about the original version,
is this OK with you too?

Thanks,
Richard

> On 11/20/2013 01:06 PM, Richard Sandiford wrote:
>> 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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