[clang] [CIR] Lower undef and poison initializers of any type in CXXABILowering (PR #230901)

[Steffen Larsen via cfe-commits]

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

This looks reasonable to me, but I would prefer the codeowners approve it as well.

https://github.com/llvm/llvm-project/pull/230901