[jdk17u-dev] RFR: 8271891: mark hotspot runtime/Safepoint tests which ignore external VM flags

[Goetz Lindenmaier]

I backport this for parity with 17.0.10-oracle.

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Commit messages:
 - Backport 6c17e6deb2ab36c3db8577fb6bb2cf2738b58dd4

Changes: https://git.openjdk.org/jdk17u-dev/pull/1764/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1764&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8271891
  Stats: 2 lines in 2 files changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1764.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1764/head:pull/1764

PR: https://git.openjdk.org/jdk17u-dev/pull/1764