[clang] [CIR] Allow boolean operands in cir.cmp (PR #206846)

[Andy Kaylor via cfe-commits]

https://github.com/andykaylor commented:

This seems OK, but I wonder if it's the right place for the fix. If I perform a comparison with `bool` value, the AST contains a cast to an `int`. I'm curious why that doesn't happen in the enum case. Assuming there's a good reason for that, is representing the enum value as `!cir.bool` the right thing for us to be doing?

https://github.com/llvm/llvm-project/pull/206846