RFR: 8317358: G1: Make TestMaxNewSize use createTestJvm [v2]

[Leo Korinth]

> In addition remove deprecated `Long(long)` constructor and rewrite `compareTo` to use `> 0` instead of `== 1`.
> 
> Also remove unused `isRunningG1(String[] args)` and `checkIncompatibleNewSize(String[] flags)`
> 
> Minimal testing completed, will run tier testing before pushing.

Leo Korinth 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 three additional commits since the last revision:

 - @key flag-sensitive
 - Merge branch '_master_jdk' into _8317358
 - 8317358: G1: Make TestMaxNewSize use createTestJvm

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16012/files
  - new: https://git.openjdk.org/jdk/pull/16012/files/ca9f1d8c..202fc48e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16012&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16012&range=00-01

  Stats: 39284 lines in 1299 files changed: 24215 ins; 7280 del; 7789 mod
  Patch: https://git.openjdk.org/jdk/pull/16012.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16012/head:pull/16012

PR: https://git.openjdk.org/jdk/pull/16012