RFR: 8264173: [s390] Improve Hardware Feature Detection And Reporting

[Lutz Schmidt]

This enhancement is intended to improve the hardware feature detection and reporting, in particular for more recently introduced hardware. The enhancement is a prerequisite for possible future feature exploitation. 

Reviews are highly welcome and appreciated.

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Commit messages:
 - 8264173: [s390] Improve Hardware Feature Detection And Reporting

Changes: https://git.openjdk.java.net/jdk/pull/3196/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3196&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264173
  Stats: 549 lines in 4 files changed: 340 ins; 74 del; 135 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3196.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3196/head:pull/3196

PR: https://git.openjdk.java.net/jdk/pull/3196