[jdk17u-dev] RFR: 8317228: GC: Make TestXXXHeapSizeFlags use createTestJvm

[Andrew Lu]

I backport this for parity with 17.0.13-oracle.

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Commit messages:
 - Backport 7ca0ae94159ac0fd2df23ee1a1e8cf626ce31048
 - Backport 7ca0ae94159ac0fd2df23ee1a1e8cf626ce31048

Changes: https://git.openjdk.org/jdk17u-dev/pull/2724/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2724&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317228
  Stats: 59 lines in 6 files changed: 44 ins; 5 del; 10 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2724.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2724/head:pull/2724

PR: https://git.openjdk.org/jdk17u-dev/pull/2724