RFR: 8339834: Replace usages of -mx and -ms in some tests [v2]

[Jaikiran Pai]

> Can I please get a review of this trivial change which replaces the usages of `-mx` and `-ms` to `-Xmx` and `-Xms` in tests and in one code comment?
> 
> As noted in https://bugs.openjdk.org/browse/JDK-8339834, these options are outdated and support for them will soon be deprecated and removed as part of https://bugs.openjdk.org/browse/JDK-8286851.
> 
> There are some more tests remaining in client-libs area which too require a similar change. I'll be creating a separate JBS issue and PR for that.

Jaikiran Pai has updated the pull request incrementally with one additional commit since the last revision:

  update JImageToolTest too

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20930/files
  - new: https://git.openjdk.org/jdk/pull/20930/files/51d15461..8214fdb5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20930&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20930&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20930.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20930/head:pull/20930

PR: https://git.openjdk.org/jdk/pull/20930