RFR: 8351444: Shenandoah: Class Unloading may encounter recycled oops [v2]

[William Kemper]

> Not clean, but not hard to resolve.

William Kemper has updated the pull request incrementally with one additional commit since the last revision:

  Remove vestigial inline is_in implementation

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Changes:
  - all: https://git.openjdk.org/shenandoah-jdk21u/pull/177/files
  - new: https://git.openjdk.org/shenandoah-jdk21u/pull/177/files/ccd1ba06..ee804750

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=177&range=01
 - incr: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=177&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/177.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/177/head:pull/177

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/177