RFR: 8348400: GenShen: assert(ShenandoahHeap::heap()->is_full_gc_in_progress() || (used_regions_size() <= _max_capacity)) failed: Cannot use more than capacity #

[William Kemper]

Conflict caused by `SIZE_FORMAT -> %zu` change.

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Commit messages:
 - Backport 5672a934fa1b0b42ae9bb39b31579a27e3332c28

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/184/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=184&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348400
  Stats: 63 lines in 2 files changed: 48 ins; 3 del; 12 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/184.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/184/head:pull/184

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/184