[clang-tools-extra] [InstCombine] Canonicalize `(X +/- Y) & Y` into `~X & Y` when Y is a power of 2 (PR #67915)

[Nikita Popov via cfe-commits]

nikic wrote:

Can you please pre-commit the new tests as well (and double-check that there is no unexpected operand order canonicalization while doing that)?

https://github.com/llvm/llvm-project/pull/67915