RFR: 8343468: GenShen: Enable relocation of remembered set card tables

[William Kemper]

Conflict in risc-v code, trivial resolution.

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Commit messages:
 - 8343468: GenShen: Enable relocation of remembered set card tables

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/186/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=186&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343468
  Stats: 320 lines in 25 files changed: 183 ins; 87 del; 50 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/186.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/186/head:pull/186

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/186