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

[Johannes Doerfert via llvm-commits]

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