[llvm] [SCEVPatternMatch] Extend with more matchers (PR #138836)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

This looks ok, but I think the naming needs more consideration. I think the general intention is to use the same names as PatternMatch but with an m_scev prefix, so I left suggestions accordingly.

https://github.com/llvm/llvm-project/pull/138836