[jdk22u] RFR: 8323021: Shenandoah: Encountered reference count always attributed to first worker thread

[William Kemper]

Clean backport, trivial fix.

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Commit messages:
 - Backport f0e2e4311b8cab160dc9e35f43e9ae5a145c5e23

Changes: https://git.openjdk.org/jdk22u/pull/9/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=9&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323021
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk22u/pull/9.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/9/head:pull/9

PR: https://git.openjdk.org/jdk22u/pull/9