[llvm] [DebugInfo] Preserve line and column number when merging debug info. (PR #129960)

[Paul T Robinson via llvm-commits]

pogo59 wrote:

The commit message should say "arbitrary but deterministic." If it's just arbitrary, the workload got lucky and it might not remain lucky. If it's deterministic, the luck won't change.

https://github.com/llvm/llvm-project/pull/129960