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

[Steffen Larsen via cfe-commits]

https://github.com/steffenlarsen commented:

Looks reasonable to me, but I am not sure I fully comprehend the implications of moving the undef/posion initializer lowering to earlier.

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