[clang] [llvm] [CIR][ABI] Add ABI metadata fields to RecordType (PR #188300)

[Andy Kaylor via cfe-commits]

https://github.com/andykaylor commented:

This looks OK to me, but I'd really like input from @xlauko and @bcardosolopes about this direction, as it's breaking new ground relative to anything we've done so far.

https://github.com/llvm/llvm-project/pull/188300