RFR: 8297992: Tests fail after JDK-8297215 due to lack of @enablePreview

[Jie Fu]

Hi all,

The following 3 tests fail with debug VMs due to lack of @enablePreview after JDK-8297215.


* jtreg:test/jdk/java/lang/Thread/virtual/stress/GetStackTraceALot.java
* jtreg:test/jdk/java/lang/Thread/virtual/HoldsLock.java
* jtreg:test/jdk/jdk/internal/vm/Continuation/Basic.java


Let's fix them.

Thanks.
Best regards,
Jie

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Commit messages:
 - 8297992: Tests fail after JDK-8297215 due to lack of @enablePreview

Changes: https://git.openjdk.org/jdk/pull/11469/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11469&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297992
  Stats: 3 lines in 3 files changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11469.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11469/head:pull/11469

PR: https://git.openjdk.org/jdk/pull/11469