[jdk17u-dev] RFR: 8281181: Do not use CPU Shares to compute active processor count

[Matthias Baesken]

8281181: Do not use CPU Shares to compute active processor count

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Commit messages:
 - Backport a5411119c383225e9be27311c6cb7fe5d1700b68

Changes: https://git.openjdk.org/jdk17u-dev/pull/517/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=517&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8281181
  Stats: 43 lines in 4 files changed: 28 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/517.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/517/head:pull/517

PR: https://git.openjdk.org/jdk17u-dev/pull/517