RFR: 8329031: CPUID feature detection for Advanced Performance Extensions (Intel® APX) [v2]

[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:

  Review comments resolutions.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18562/files
  - new: https://git.openjdk.org/jdk/pull/18562/files/0881e43c..b5da0938

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18562&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18562&range=00-01

  Stats: 34 lines in 3 files changed: 14 ins; 3 del; 17 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