[PATCH] Scalarize select vector arguments when extracted

[Matt Arsenault]

Hi nadav,

When the elements are extracted from a select, do the select on the extracted scalars from the input.

With this, the vectorizer still isn't able to put a vector select back together. It is skipped because some of the insertelements are before the last select being vectorized.

Also fixes some missing CHECK-LABELs in the test that changed, but those are separate.

http://llvm-reviews.chandlerc.com/D1539

Files:
  lib/Transforms/InstCombine/InstCombineVectorOps.cpp
  test/Transforms/InstCombine/select-extractelement.ll
  test/Transforms/LoopVectorize/minmax_reduction.ll
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