The tracer tool needs to remember the begin timestamps for API
callbacks, and uses a thread_local std::stack for that purpose.
The issue with thread_local objects is that they are destructed
before anything else when the main thread exits. To work around
that issue, we use a "safe" stack in the roctracer API.
Use the same "safe" stack in the tracer tool.
Change-Id: I0d69d4eb44f0205f4102d0d5ef9803a1ec1800a5
[ROCm/roctracer commit: b664937ebd]
Laurent Morichetti
6ea76c581b