RFR: 7903696: JMH: Add xctrace-based perfasm profiler for macOS [v3]

[Dmitry Tsitelov]

On Fri, 19 Apr 2024 07:51:17 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> > Could you add any hints for an early adopter on how to check it from a development branch?
> 
> Look at PR body, "Reviewing", there is a section how to fetch the dev-branch.

Thank you for the hint, Alexey. 
My question was mostly about the prerequisites required to use the xctrace profiling feature:
- do I need to install any prerequisites except XCode?
- shall I create some specific instruments.app profile? 

Extra: can Instruments' CPU counters facility be used to profile cache misses and so on?

-------------

PR Comment: https://git.openjdk.org/jmh/pull/130#issuecomment-2067030623