Collect multiple trace samples from a single benchmark run

Add a pointer to any prior users list discussion. Currently we can collect one trace sample during a benchmark run. We use '-trace_after_instrs' and '-exit_after_tracing' to select a trace point.

Is your feature request related to a problem? Please describe. We need to run the benchmark multiple times to collect traces throughout the benchmark execution. For long running benchmark, this may take a very long time.

Describe the solution you'd like Have a way to ‘trace x million insts every y million insts’. A more advanced method would be to have a config file listing the sampling windows.

Do you have any implementation in mind for this feature? No

Describe alternatives you've considered Currently we plan to run the benchmark with a diff sampling point.

Additional context None.