[PATCH] D85592: [Attributor] Add flag for undef value to the state of AAPotentialValues

[Shinji Okumura via Phabricator via llvm-commits]

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Currently, an undef value is reduced to 0 when it is added to a set of potential values.
This patch introduces a flag for under values. By this, for example, we can merge two states `{undef}`, `{1}` to `{1}` (because we can reduce the undef to 1).


https://reviews.llvm.org/D85592

Files:
  llvm/include/llvm/Transforms/IPO/Attributor.h
  llvm/lib/Transforms/IPO/AttributorAttributes.cpp

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