[PATCH] D150093: [KnownBits] Add implementation for `KnownBits::sdiv`

[Noah Goldstein via Phabricator via llvm-commits]

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Can figure out some of the upper bits (similiar to `udiv`) if we know
the sign of the inputs.

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


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150093

Files:
  llvm/include/llvm/Support/KnownBits.h
  llvm/lib/Support/KnownBits.cpp
  llvm/unittests/Support/KnownBitsTest.cpp

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