[jdk21u-dev] RFR: 8323635: Test gc/g1/TestHumongousAllocConcurrentStart.java fails with -XX:TieredStopAtLevel=3

[Andrew Lu]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport 5045839cb2095105a5c6c9eebc633a78b1e3213e
 - Backport 5045839cb2095105a5c6c9eebc633a78b1e3213e

Changes: https://git.openjdk.org/jdk21u-dev/pull/589/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=589&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323635
  Stats: 4 lines in 1 file changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/589.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/589/head:pull/589

PR: https://git.openjdk.org/jdk21u-dev/pull/589