RFR: 8317347: Parallel: Make TestInitialTenuringThreshold use createTestJvm

[Thomas Schatzl]

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.

Seems good.

-------------

Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16009#pullrequestreview-1659507211