[clang] [CIR] Fix NYI AAPCS bit-fields by skipping unsupported case (PR #145560)

[Andy Kaylor via cfe-commits]

https://github.com/andykaylor approved this pull request.

Thanks for handling this!

I have a minor comment, but let's just merge this as is to get the tests passing.

https://github.com/llvm/llvm-project/pull/145560