[jdk11u-dev] RFR: 8317228: GC: Make TestXXXHeapSizeFlags use createTestJvm [v5]

[Andrew Lu]

> I backport this for parity with 11.0.25-oracle.

Andrew Lu has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge branch 'master' of github.com:luchenlin/jdk11u-dev into backport_8317228
 - remove "@key gc"
 - remove "@key gc"
 - Backport 7ca0ae94159ac0fd2df23ee1a1e8cf626ce31048
 - Backport 7ca0ae94159ac0fd2df23ee1a1e8cf626ce31048

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

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2864/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2864/files/755e1af3..7ffd301d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2864&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2864&range=03-04

  Stats: 1060 lines in 45 files changed: 819 ins; 55 del; 186 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