[crac] RFR: 8368929: [CRaC] Move CPUFeatures check to C/R engine [v12]

[Radim Vansa]

> Right now the logic checking if CPU features used before checkpoint match current CPU features is in VM code. VM stores and retrieves CPU features through C/R API's user_data extension. This is convenient when we have a single image that can be either accepted or rejected, but does not offer the flexibility for C/R engine to select the best image for current execution environment.
> 
> The goal of this issue is to move to a declarative API that will express the requirements using more abstract means, labels (for CPU architecture) and bitmaps (for CPU features).

Radim Vansa has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 15 commits:

 - Improve crlib docs
 - Merge remote-tracking branch 'origin/crac' into 8368929_external_cpu_features
 - Apply suggestions from code review
   
   Co-authored-by: Timofei Pushkin <pushkin.td at gmail.com>
 - Fix include problems
 - Fixup
 - Other platforms fixup
 - Fixup
 - Review update
 - Fix windows build
 - Reset conf before 2nd checkpoint
 - ... and 5 more: https://git.openjdk.org/crac/compare/a6adb7d3...9c0464f9

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Changes: https://git.openjdk.org/crac/pull/266/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=266&range=11
  Stats: 972 lines in 22 files changed: 767 ins; 82 del; 123 mod
  Patch: https://git.openjdk.org/crac/pull/266.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/266/head:pull/266

PR: https://git.openjdk.org/crac/pull/266