[jdk17u] RFR: 8274349: ForkJoinPool.commonPool() does not work with 1 CPU

[David Holmes]

Hi all,

    this pull request contains a backport of commit 2e542e33 from the openjdk/jdk repository.

    The commit being backported was authored by David Holmes on 4 Oct 2021 and was reviewed by Aleksey Shipilev and Martin Buchholz.

    Thanks!

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Commit messages:
 - Backport 2e542e33b81a53652956bb5e9636e7f4af5540f7

Changes: https://git.openjdk.java.net/jdk17u/pull/151/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=151&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274349
  Stats: 84 lines in 3 files changed: 80 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/151.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/151/head:pull/151

PR: https://git.openjdk.java.net/jdk17u/pull/151