RFR: 8374743: [Leyden] G1 tries to start a concurrent mark allocating a humongous object during initialization

[Thomas Schatzl]

Hi all,

  please review this small change that prevents opportunistic concurrent mark during humongous object allocation when the VM is not initialized yet.

Patch provided by @fisk

Testing: gha, failing test case

Thanks,
  Thomas

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Commit messages:
 - 8374743

Changes: https://git.openjdk.org/jdk/pull/29119/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29119&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374743
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29119.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29119/head:pull/29119

PR: https://git.openjdk.org/jdk/pull/29119