[llvm] [NFC] Remove UnwindTable dependency on CIE, and FDE (PR #142520)

[Paul Kirth via llvm-commits]

https://github.com/ilovepi commented:

The C++ changes look mostly fine, since they're mechanical, but this type of change is something that code owners should weigh in on. I'd also make the description more complete about the rationale for doing this. 

https://github.com/llvm/llvm-project/pull/142520