RFR: 8352185: Shenandoah: Invalid logic for remembered set verification

[William Kemper]

Clean backport.

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Commit messages:
 - Backport 4d1de46cb882bade5781255b646f623b55d7180f

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/188/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=188&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352185
  Stats: 51 lines in 4 files changed: 27 ins; 16 del; 8 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/188.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/188/head:pull/188

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/188