[libunwind] [OpenMP] Improve omp offload profiler (PR #68016)

[Johannes Doerfert via cfe-commits]

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@@ -79,15 +79,15 @@ struct TimeTraceProfilerEntry {
   // Calculate timings for FlameGraph. Cast time points to microsecond precision
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jdoerfert wrote:

Can you split the changes to this file into a separate PR? Also check the file, the comment still states microseconds.

https://github.com/llvm/llvm-project/pull/68016