[lworld] RFR: 8252650: [lworld] Merge of jdk-16+8 breaks debug build GC gc/TestObjectAlignment.java

[David Simms]

Apply in advance: 8251118: BiasedLocking::preserve_marks should not have a HandleMark

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Commit messages:
 - 8252650: [lworld] Merge of jdk-16+8 breaks debug build GC gc/TestObjectAlignment.java

Changes: https://git.openjdk.java.net/valhalla/pull/172/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=172&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252650
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/172.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/172/head:pull/172

PR: https://git.openjdk.java.net/valhalla/pull/172