RFR: 8312916: Remove remaining usages of -Xdebug from test/hotspot/jtreg

[Jaikiran Pai]

Can I please get a review of this test-only change which removes usages of the deprecated (no-op) `-Xdebug` from these tests? I missed these files when addressing https://bugs.openjdk.org/browse/JDK-8227229.

tier testing with these changes has passed without issues.

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Commit messages:
 - 8312916: Remove remaining usages of -Xdebug from test/hotspot/jtreg

Changes: https://git.openjdk.org/jdk/pull/15016/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15016&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312916
  Stats: 6 lines in 3 files changed: 0 ins; 4 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/15016.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15016/head:pull/15016

PR: https://git.openjdk.org/jdk/pull/15016