[crac] RFR: Synchronize CPUFeatures with JDK trunk

[Jan Kratochvil]

It also fixes an off-by-one regression from #88.

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Commit messages:
 - Synchronize CPUFeatures with JDK trunk

Changes: https://git.openjdk.org/crac/pull/105/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=105&range=00
  Stats: 17 lines in 2 files changed: 12 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/crac/pull/105.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/105/head:pull/105

PR: https://git.openjdk.org/crac/pull/105