[clang] Allow packing fields into tail padding of record fields (PR #122197)

[David Blaikie via cfe-commits]

https://github.com/dwblaikie commented:

Thanks! Looks plausible to me, would be great to get @Michael137's take on it, since he's been looking at this sort of thing a fair bit lately.

https://github.com/llvm/llvm-project/pull/122197