RFR: 8317347: Parallel: Make TestInitialTenuringThreshold use createTestJvm

[Leo Korinth]

On Mon, 2 Oct 2023 11:48:18 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

> Also add parallel flag for first invocation (this is a bug). Initial testing ok, but will run tiers before pushing.

Thanks Ivan and Thomas!!!

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PR Comment: https://git.openjdk.org/jdk/pull/16009#issuecomment-1766033054