[PATCH] CVP: Improve handling of Selects used as incoming PHI values

[Björn Steinbrink]

Updated the patch to use getConstantOnEdge to improve readability. Added a
simpler test case without a loop and a negative test case.  LVI doesn't support
vector types yet, so there's no test for that, but I left a note that support
for vector types may be added later.


http://reviews.llvm.org/D9051

Files:
  lib/Transforms/Scalar/CorrelatedValuePropagation.cpp
  test/Transforms/CorrelatedValuePropagation/select.ll

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