[PATCH] D86349: [Attributor] Fix IntegerRangeState::unionKnown

[Shinji Okumura via Phabricator via llvm-commits]

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Currently, the assumed range is taken union with a new known range in `IntegerRangeState::unionKnown`.
However, that is unnecessary because an assumed range is guaranteed to be subsumed by a known range.


https://reviews.llvm.org/D86349

Files:
  llvm/include/llvm/Transforms/IPO/Attributor.h
  llvm/test/Transforms/Attributor/potential.ll
  llvm/test/Transforms/Attributor/range.ll

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