Jakob Johnson e6c84f82b8 Add thin wrapper for perf_event_open API ...

- Add PerfEvent class to handle creating ring buffers and handle the resources associated with a perf_event
  - Refactor IntelPT collection code to use this new API
  - Add TSC to timestamp conversion logic with unittest

Differential Revision: https://reviews.llvm.org/D121734

2022-03-21 13:38:52 -07:00

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