[llvm] [RemoveDIs] Read/write DbgRecords directly from/to bitcode (PR #83251)

[Teresa Johnson via llvm-commits]

teresajohnson wrote:

Great to hear that this will be a size and performance improvement for LTO! I have added @dwblaikie as a reviewer, as he is way more familiar with debug info internals and probably a better person to take a look at the changes.

https://github.com/llvm/llvm-project/pull/83251