RFR: 8352738: Implement JEP 520: JFR Method Timing and Tracing [v3]

[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 incrementally with one additional commit since the last revision:

  Atomic::load_acquire(&_method_tracer_state);

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25306/files
  - new: https://git.openjdk.org/jdk/pull/25306/files/489fd830..c274da49

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25306&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25306&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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