[jdk21u-dev] RFR: 8339148: Make os::Linux::active_processor_count() public [v3]

[Goetz Lindenmaier]

> I backport this for parity with 21.0.8-oracle
> 
> Trivial resolve, probably clean anyways.

Goetz Lindenmaier has refreshed the contents of this pull request, and previous commits have been removed. Incremental views are not available. The pull request now contains one commit:

  Backport 12d060a255b9b783488714c6c2cb73a899d3f708

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Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/1553/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/1553/files/a7a05945..bdc072e3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1553&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1553&range=01-02

  Stats: 17856 lines in 186 files changed: 2991 ins; 9124 del; 5741 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1553.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1553/head:pull/1553

PR: https://git.openjdk.org/jdk21u-dev/pull/1553