[llvm] [LV] Stop using the legacy cost model for udiv + friends (PR #152707)

[Luke Lau via llvm-commits]

https://github.com/lukel97 commented:

I accidentally ended up writing the same patch in #154468 to fix https://github.com/llvm/llvm-project/issues/154103 :)

https://github.com/llvm/llvm-project/pull/152707