[clang] [Clang] Reuse tail-padding for more types that are not POD for the purpose of layout (PR #90462)

[Shafik Yaghmour via cfe-commits]

shafik wrote:

Looks like this is ready to land, if you have reached out to the Fuchsia and XL folks you should be good.

https://github.com/llvm/llvm-project/pull/90462