[clang] [clang][DebugInfo] Add inlined subprogram metadata for compiler built-ins (PR #189969)

[J. Ryan Stinnett via cfe-commits]

jryans wrote:

I know @dwblaikie and others will likely want to see how this affect debug info size on disk. I'm still working on collecting that data for this feature. I'm hoping to update the PR with those metrics tomorrow.

https://github.com/llvm/llvm-project/pull/189969