[jdk21u-dev] RFR: 8311656: Shenandoah: Unused ShenandoahSATBAndRemarkThreadsClosure::_claim_token

[Kerem Kat]

Remove `unused _claim_token field` from `ShenandoahSATBAndRemarkThreadsClosure`.

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Commit messages:
 - Backport 0b0e064e36082200ace384c92eae02d3f7baa7ba

Changes: https://git.openjdk.org/jdk21u-dev/pull/1055/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1055&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311656
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1055.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1055/head:pull/1055

PR: https://git.openjdk.org/jdk21u-dev/pull/1055