[crac] RFR: Support -XX:+IgnoreCPUFeatures during -XX:CRaCRestoreFrom [v5]

[Jan Kratochvil]

> Support -XX:+IgnoreCPUFeatures during -XX:CRaCRestoreFrom

Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:

 - Merge branch 'crac' into crac-restoreignore
 - Remove an unused nonlibc_str_equals declaration.
    - found by Anton Kozlov
 - Implement -XX:+IgnoreCPUFeatures
 - Merge branch 'crac' into crac-restoreignore
 - Split off crac_restore_finalize() from crac_restore().
 - Document -XX:CPUFeatures=ignore, reject !ignore during -XX:CRaCRestoreFrom
 - Support -XX:CPUFeatures=ignore during -XX:CRaCRestoreFrom

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Changes: https://git.openjdk.org/crac/pull/100/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=100&range=04
  Stats: 45 lines in 11 files changed: 30 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/crac/pull/100.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/100/head:pull/100

PR: https://git.openjdk.org/crac/pull/100