RFR: Merge openjdk/jdk21u-dev:master [v2]

[William Kemper]

> Merges tag jdk-21.0.3+2

William Kemper has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 13 commits:

 - Merge branch 'master' into merge-jdk-21.0.3+2
 - 8325096: Test java/security/cert/CertPathBuilder/akiExt/AKISerialNumber.java is failing
   
   Backport-of: ac1cd3194910793b02e86c2c0dedaa321f137d4e
 - 8321410: Shenandoah: Remove ShenandoahSuspendibleWorkers flag
   
   Backport-of: 2830dd2a7d3b933fbddca64ca0ac7a91e7ab0775
 - 8322957: Generational ZGC: Relocation selection must join the STS
   
   Reviewed-by: eosterlund, stefank
   Backport-of: ba23025cd8a9c1af37afea6444ce5ea2ff41e5af
 - 8313670: Simplify shared lib name handling code in some tests
   
   Reviewed-by: mdoerr, lucy
   Backport-of: 6dba2026d72de6a67aa0209749ded8174b088904
 - 8309697: [TESTBUG] Remove "@requires vm.flagless" from jtreg vectorization tests
   
   Reviewed-by: shade
   Backport-of: a03954e6c57369446ef77136966662780e4b1c4e
 - 8323637: Capture hotspot replay files in GHA
   
   Backport-of: c84c0ab52d5e08a693f7ad7d9a4772d8c1eeeaa8
 - 8324937: GHA: Avoid multiple test suites per job
   
   Backport-of: 1aba78f2720b581f18fc2cec5e84deba6b2bcd41
 - 8320052: Zero: Use __atomic built-ins for atomic RMW operations
   
   Backport-of: 020c9007f8e9cc4b46a58d7955284f43a6ac913b
 - 8319382: com/sun/jdi/JdwpAllowTest.java shows failures on AIX if prefixLen of mask is larger than 32 in IPv6 case
   
   Backport-of: 22642ff0aac71eceb71f6a9eebb2988a9bd5f091
 - ... and 3 more: https://git.openjdk.org/shenandoah-jdk21u/compare/64284052...83cb3dc1

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Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/20/files
 Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=20&range=01
  Stats: 1350 lines in 66 files changed: 895 ins; 356 del; 99 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/20.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/20/head:pull/20

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/20