[PATCH] D116236: [InstCombine] (b & ~a & ~c) | ~(a | b) --> ~((b & c) | a)

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

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And inverted case `(b | ~a | ~c) & ~(a & b)` --> `~((b | c) & a)`.
This is demorganed version of the same expression with LHS
`(b & ~(a | c))`, where LHS was not demorganed due to extra
uses.


https://reviews.llvm.org/D116236

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  llvm/test/Transforms/InstCombine/and-xor-or.ll

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