[llvm] [DWARFLinker] Add assembly-label range handling to parallel linker (PR #195366)

[via llvm-commits]

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alx32 wrote:

Should this also fire for the new assembly-range path above? That branch returns early, so kept labels in assembly CUs no longer show up here under `--verbose`, which seems a behavior change from both classic and the pre-patch parallel path.

https://github.com/llvm/llvm-project/pull/195366