[llvm] [SelectionDAG] Add computeKnownBits for ISD::ROTL/ROTR. (PR #156142)

[Sergei Barannikov via llvm-commits]

https://github.com/s-barannikov commented:

May it make sense to move this to KnownBits? This could be used in the middle end with the corresponding intrinsics.


https://github.com/llvm/llvm-project/pull/156142