[PATCH] D154791: [InstCombine] Transform bitwise (A << X, zext(icmp)) -> zext (bitwise(A < 0, icmp)) fold.

[Noah Goldstein via Phabricator via llvm-commits]

goldstein.w.n added a comment.

Throughout the comments/summary/title can you replace `X` with `C` to indicate its a constant. Also in a few places you forget the `-1` in its description as `sizeof_bits(A) - 1`.


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https://reviews.llvm.org/D154791