[PATCH] D23227: [IndVarSimplify] Integrate changes in D18777 and D18867 which depend on each other

[Li Huang via llvm-commits]

lihuang created this revision.
lihuang added a reviewer: sanjoy.
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Integrate changes in D18777 and D18867 which depend on each other.

Finally, changes in D18777 and D18867 depend on each other and should be checked in at the same time, otherwise will break tests.

https://reviews.llvm.org/D23227

Files:
  lib/Analysis/ValueTracking.cpp
  lib/Transforms/Scalar/IndVarSimplify.cpp
  test/Analysis/ValueTracking/known-non-negative.ll
  test/Transforms/BBVectorize/loop1.ll
  test/Transforms/IndVarSimplify/iv-widen-elim-ext.ll

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