[jdk25] RFR: 8361529: GenShen: Fix bad assert in swap card tables

[William Kemper]

Clean backport. Fixes bad pointer in assert.

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Commit messages:
 - Backport 1de2acea77da57fd44b214332a73cc6621806e4d

Changes: https://git.openjdk.org/jdk/pull/26228/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26228&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361529
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26228.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26228/head:pull/26228

PR: https://git.openjdk.org/jdk/pull/26228