[jdk11u-dev] RFR: 8317228: GC: Make TestXXXHeapSizeFlags use createTestJvm [v2]

[Andrew Lu]

> I backport this for parity with 11.0.25-oracle.

Andrew Lu has updated the pull request incrementally with one additional commit since the last revision:

  Backport 7ca0ae94159ac0fd2df23ee1a1e8cf626ce31048

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2864/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2864/files/3e88151f..bfa4783b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2864&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2864&range=00-01

  Stats: 6 lines in 1 file changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2864.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2864/head:pull/2864

PR: https://git.openjdk.org/jdk11u-dev/pull/2864