[llvm] [LLParser] Merge xor constantexpr parsing with add/mul/shl/lshr/ashr. (PR #67371)

[Nikita Popov via llvm-commits]

nikic wrote:

> Not sure if xor is sticking around or not. I see and/or was already removed.

It should be removed as well at some point.

https://github.com/llvm/llvm-project/pull/67371