RFR: 8329031: CPUID feature detection for Advanced Performance Extensions (Intel® APX) [v4]

[Jatin Bhateja]

> Summary of changes include with the patch:-
> 
> 1) CPUID based feature detection check for Intel APX extension (https://www.intel.com/content/www/us/en/developer/articles/technical/advanced-performance-extensions-apx.html)
> 2) Validation during VM initialization for extended GPRs state save / restoration by OS across context switches of java application threads executing JIT compiled code with new APX ISA.
> 
> Kindly review and share your feedback.
> 
> Best Regards,
> Jatin

Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:

  Lazy restored state comparison after OS signal handling.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18562/files
  - new: https://git.openjdk.org/jdk/pull/18562/files/68df08ce..d8fcde93

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18562&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18562&range=02-03

  Stats: 40 lines in 2 files changed: 17 ins; 16 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/18562.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18562/head:pull/18562

PR: https://git.openjdk.org/jdk/pull/18562