[clang] [llvm] [IR] Don't use TrackingMDNodeRef for DebugLoc (PR #200649)

[Stephen Tozer via cfe-commits]

SLTozer wrote:

> Is it this one? https://discourse.llvm.org/t/rfc-refactoring-dilocation-to-use-compact-function-local-storage/85618

Yes (at least I assume that's the one being referred to!), although there is also a more recent version: https://discourse.llvm.org/t/rfc-function-local-metadata-ir-and-api-changes/90966

https://github.com/llvm/llvm-project/pull/200649