[clang] [llvm] Non constant size and offset in DWARF (PR #141106)

[Tom Tromey via cfe-commits]

tromey wrote:

I've rebased this and addressed the review comments.  I am leaving the one sub-thread open since I wasn't sure if I should send a separate PR (I don't have push rights so I can't land something separately on my own) -- just let me know if you'd like that, it's no trouble.  Thanks.

https://github.com/llvm/llvm-project/pull/141106