[jdk11u-dev] RFR: 8317316: G1: Make TestG1PercentageOptions use createTestJvm

[Andrew Lu]

I backport this for parity with 11.0.25-oracle.

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Commit messages:
 - Backport d8cd60588aef6abcbfedbe3262d9a094c9bbcb8c

Changes: https://git.openjdk.org/jdk11u-dev/pull/2859/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2859&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317316
  Stats: 6 lines in 1 file changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2859.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2859/head:pull/2859

PR: https://git.openjdk.org/jdk11u-dev/pull/2859