[jdk21u-dev] RFR: 8339148: Make os::Linux::active_processor_count() public [v2]

[Goetz Lindenmaier]

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

Goetz Lindenmaier has updated the pull request incrementally with one additional commit since the last revision:

  Backport dbdbbd473061d7e8077ed07ccc6b03065a8c2ffc

-------------

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

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1553&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1553&range=00-01

  Stats: 17668 lines in 186 files changed: 9123 ins; 2990 del; 5555 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