[jdk21u-dev] RFR: 8315988: Parallel: Make TestAggressiveHeap use createTestJvm

[Goetz Lindenmaier]

I backport this to keep the 21u test suite up-to-date. This will simplify future test backports.

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Commit messages:
 - Backport fbc766ee21ff7e6d414bd7d2c8bd7c9e1889a8af

Changes: https://git.openjdk.org/jdk21u-dev/pull/40/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=40&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315988
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/40.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/40/head:pull/40

PR: https://git.openjdk.org/jdk21u-dev/pull/40