[clang] [clang] Use File Location for debug info resolution. (PR #163982)

[David Blaikie via cfe-commits]

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

Seems worth a go - @adrian-prantl @JDevlieghere @jmorse you folks on board with this, or want some more time to experiment (maybe have it behind a flag, etc)?

https://github.com/llvm/llvm-project/pull/163982