RFR: 8335358: [premain] Explore alternative ways to trigger the end of training run [v11]

[Mat Carter]

> AOT training can be ended using either
> 
> - -XX: AOTEndTrainingOnMethodEntry =Hello.someMethod [same syntax as CompileOnly]
> - -XX: AOTEndTrainingOnMethodEntry =Hello.someMethod,Hello.someOtherMethod,count=42
> - jcmd <pid> AOT.end_training
> 
> supports arm64 and x64
> 
> note: the AOTEndTrainingOnMethodEntry is ignored when not recording
> 
> JBS Issue: https://bugs.openjdk.org/browse/JDK-8335358

Mat Carter has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 43 additional commits since the last revision:

 - Enhanced upcall system testing options (based on PR feedback)
 - Removing unused includes
 - Remove cds include, no longer required after refactor
 - merge issue
 - fix merge issues
 - Update other platforms
 - Merge branch 'premain' into macarte-endtraining
 - Merge pull request #2 from macarte/macarte-endtraining-refactor
   
   Macarte endtraining refactor
 - minor edits
 - small changes based on PR review
 - ... and 33 more: https://git.openjdk.org/leyden/compare/4af49dbe...9c3cdf78

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

Changes:
  - all: https://git.openjdk.org/leyden/pull/21/files
  - new: https://git.openjdk.org/leyden/pull/21/files/63d60ae9..9c3cdf78

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=leyden&pr=21&range=10
 - incr: https://webrevs.openjdk.org/?repo=leyden&pr=21&range=09-10

  Stats: 238173 lines in 2437 files changed: 209373 ins; 15575 del; 13225 mod
  Patch: https://git.openjdk.org/leyden/pull/21.diff
  Fetch: git fetch https://git.openjdk.org/leyden.git pull/21/head:pull/21

PR: https://git.openjdk.org/leyden/pull/21