[PATCH] Extend SLPVectorizer for cases where insertelement instructions must be rescheduled

[Nadav Rotem]

  Hi Arch,

  Thanks for working on this. It is not clear to me what is the difference between the InsertElement and the IgnoreScheduling list that is used by reduction variables. The InsertElements that we care about build a vector, which is a kind of a reduction. Is there anything unique about the build vector, or is it just another reduction?

  Also, please split the cost-model fixes and the typo fix into separate patches.

  Thanks,
  Nadav

http://llvm-reviews.chandlerc.com/D3143