[lld] [llvm] [dyndbg][LLD][ELF] Prototype LLD support for dynamic debugging (PR #190939)

[Andrew Ng via llvm-commits]

nga888 wrote:

Thanks for all the feedback so far. I've rebased this PR as it was getting quite out of date.

If the naming and approach using the new `LLVM_ELF` section type is acceptable, I will look to separate the addition of this new section type from this PR which will allow its use by the dynamic debugging compiler PR, and then convert this into a non-draft PR.

https://github.com/llvm/llvm-project/pull/190939