[jdk11u-dev] RFR: 8281181: Do not use CPU Shares to compute active processor count

[Matthias Baesken]

jdk11u-dev backport of 8281181,  copyright headers needed adjustment and minor diffs in strides

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Commit messages:
 - Backport 437c634b61c277e6af6efd243399178dd44d7126

Changes: https://git.openjdk.org/jdk11u-dev/pull/1196/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1196&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8281181
  Stats: 41 lines in 4 files changed: 27 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1196.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1196/head:pull/1196

PR: https://git.openjdk.org/jdk11u-dev/pull/1196