RFR: 8365400: Enhance JFR to emit file and module metadata for class loading [v4]

[Markus Grönlund]

> Greetings,
> 
> this enhancement adds a "source" field, label "Location" to the jdk.ClassDefine event.
> 
> To enable this functionality, JFR needs a concurrent symbol table. We can build a simpler version of a concurrent hash table, taking advantage of the JFR epoch system. This will be useful also for planned future enhancements.
> 
> Extensions are made to AOT to consistently report identical canonical paths for classes as non-AOT code paths.
> 
> Testing: jdk_jfr, manual AOT verification, stress testing
> 
> Thanks
> Markus

Markus Grönlund has updated the pull request incrementally with one additional commit since the last revision:

  adjustments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28505/files
  - new: https://git.openjdk.org/jdk/pull/28505/files/af55c2a7..d312adba

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28505&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28505&range=02-03

  Stats: 50 lines in 4 files changed: 22 ins; 3 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/28505.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28505/head:pull/28505

PR: https://git.openjdk.org/jdk/pull/28505