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

[David Blaikie via cfe-commits]

https://github.com/dwblaikie approved this pull request.

Yeah, let's just go with this as a single patch.

Looking closer, in retrospect/for next time, perhaps this could've been a few smaller patches (I guess the strtuct, member, and bit field member are all separate except that they depend on the new `MDUnsignedOrMDField` - either that could've been included in one of the patches that needed it, and the other two patches dependent on that one arbitrarily chosen - or if that could've been added/tested independently, then all 3 functional patches independently depend on it - (plus the already discussed clang change that could've been done separately - but yeah, annoying to have a dependent patch for such a small change, so probably fine to keep it in in situations like this then just send a tiny PR real quick to go in before the rest once approved)))

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