RFR: 8298067: Persistent test failures after 8296012

[Julian Waters]

After JDK-8296012 a langtools test consistently fails on x86 Linux. This is due to said test needing JVMTI and --enable-preview, but for both to be compatible VMContinuations needs to be manually enabled, since it is off by default on certain platforms. HotSpot otherwise rejects the JVMTI request if VMContinuations is not enabled

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Commit messages:
 - Persistent test failures after 8296012

Changes: https://git.openjdk.org/jdk/pull/11500/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11500&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298067
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11500.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11500/head:pull/11500

PR: https://git.openjdk.org/jdk/pull/11500