[llvm] [SCEV] Support addrec in right hand side in howManyLessThans (PR #92560)

[via llvm-commits]

mrdaybird wrote:

Thanks for help (with my first PR)! @efriedma-quic and @hiraditya! Learned a lot! Hopefully I can contribute more to LLVM.

https://github.com/llvm/llvm-project/pull/92560