RFR: 8239090: Improve CPU feature support in VM_Version

[Paul Hohensee]

This is a holdover patch previously reviewed when the jdk was under hg control. See the thread starting at

https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-September/039887.html

Reviewed by Volker Simonis (simonis) and Igor Veresov (iveresov).

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Commit messages:
 - Merge branch 'master' into JDK-8239090
 - Merge branch 'master' into JDK-8239090
 - Merge branch 'master' into JDK-8239090
 - 8239090: Improve CPU feature support in VM_Version
 - 8239090: Improve CPU feature support in VM_Version

Changes: https://git.openjdk.java.net/jdk/pull/436/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=436&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8239090
  Stats: 274 lines in 6 files changed: 61 ins; 64 del; 149 mod
  Patch: https://git.openjdk.java.net/jdk/pull/436.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/436/head:pull/436

PR: https://git.openjdk.java.net/jdk/pull/436