[llvm] [InstCombine] Simplify matchers (NFC) (PR #96665)

[Nikita Popov via llvm-commits]

https://github.com/nikic approved this pull request.

LGTM. Some of these are non-canonical, but I guess we can keep them in the interest of keeping this change NFC.

https://github.com/llvm/llvm-project/pull/96665