[llvm] IVDescriptors: improve readability of a function (NFC) (PR #106219)

[Renato Golin via llvm-commits]

https://github.com/rengolin commented:

I wouldn't recommend the xor change. Compilers are good at making that change, people are bad at recognising the pattern. 

https://github.com/llvm/llvm-project/pull/106219