RFR: 8352738: Implement JEP 520: JFR Method Timing and Tracing [v8]

[Erik Gahlin]

> Could I have a review of this enhancement that will add tracing capabilities to JFR? There are opportunities for performance improvements in the implementation, but I would rather add them later and separately.
> 
> Testing: tier 1-3, test/jdk/jdk/jfr
> 
> Thanks
> Erik

Erik Gahlin has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains eight commits:

 - Merge
 - Fix comment
 - Improve comment
 - Remove METHOD_FLAG_USED_PREVIOUS_EPOCH_BIT(method)
 - Merge
 - Atomic::load_acquire(&_method_tracer_state);
 - Reviewer feedback
 - Initial

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

Changes: https://git.openjdk.org/jdk/pull/25306/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25306&range=07
  Stats: 7075 lines in 107 files changed: 6621 ins; 363 del; 91 mod
  Patch: https://git.openjdk.org/jdk/pull/25306.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25306/head:pull/25306

PR: https://git.openjdk.org/jdk/pull/25306