8317358: G1: Make TestMaxNewSize use createTestJvm

[luchenlin]

I backport this for parity with 11.0.25-oracle.

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Progress

• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue
• [ ] JDK-8317358 needs maintainer approval

Issue

• JDK-8317358: G1: Make TestMaxNewSize use createTestJvm (Enhancement - P4)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev.git pull/2858/head:pull/2858
$ git checkout pull/2858

Update a local copy of the PR:
$ git checkout pull/2858
$ git pull https://git.openjdk.org/jdk11u-dev.git pull/2858/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2858

View PR using the GUI difftool:
$ git pr show -t 2858

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Download this PR as a diff file:
https://git.openjdk.org/jdk11u-dev/pull/2858.diff

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