[roll] Roll fuchsia [zircon] Decouple PerCpuBuffer from ktrace Ktrace implements dropped record tracking on top of the spsc buffer, a useful improvement that we'd also like to use for profiling. This pulls out the functionality into a library allowing reuse. This is a straight copy and rename of PerCpuBuffer with the one change that we now pass in an ID for which cpu it is running on so it can emit dropped record records using that id. In addition, it adds a test for the dropped-records record functionality. Original-Bug: 447156915 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1414695 Original-Revision: c8b7ee28820c2cdc22d6dd4a8e2fef933fbf614f GitOrigin-RevId: 4844a35ae71d3789f13ed0085c5141d750b8c579 Change-Id: I1b7e9848f8773af64332b03f437b76430a459480
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