[llvm] [Support][APint] Add fast path for APInt::urem if RHS is power of 2 (PR #189245)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Why did this add and then remove tests again? Did you find that there is already good coverage for division by pow2?

https://github.com/llvm/llvm-project/pull/189245