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

[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As noted in https://bugs.openjdk.org/browse/JDK-8339834, these options are outdated and support for them will soon be deprecated and removed as part of https://bugs.openjdk.org/browse/JDK-8286851.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.

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Commit messages:
 - 8339834: Replace usages of -mx and -ms in some tests

Changes: https://git.openjdk.org/jdk/pull/20930/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20930&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339834
  Stats: 15 lines in 8 files changed: 0 ins; 0 del; 15 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