RFR: 8343468: GenShen: Enable relocation of remembered set card tables [v3]

[William Kemper]

> Conflict in risc-v code, trivial resolution.

William Kemper has updated the pull request incrementally with two additional commits since the last revision:

 - Fix risc-v build (missing some parts for genshen in 21 backport)
 - Fix 32-bit build

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Changes:
  - all: https://git.openjdk.org/shenandoah-jdk21u/pull/186/files
  - new: https://git.openjdk.org/shenandoah-jdk21u/pull/186/files/4fefb753..04bd7778

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=186&range=02
 - incr: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=186&range=01-02

  Stats: 39 lines in 3 files changed: 17 ins; 8 del; 14 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