[PATCH] D150094: [KnownBits] Improve `KnownBits::udiv`

[Noah Goldstein via Phabricator via llvm-commits]

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We can more precisely determine the upper bits doing `MaxNum /
MinDenum` as opposed to only using the MSB.

As well, if the `exact` flag is set, we can sometimes determine some
of the low-bits.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150094

Files:
  llvm/include/llvm/Support/KnownBits.h
  llvm/lib/Support/KnownBits.cpp
  llvm/test/Analysis/ValueTracking/knownbits-div.ll
  llvm/unittests/Support/KnownBitsTest.cpp

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