git: openjdk/loom: fibers: Add test to ensure exception thrown when not running with --enable-preview

[duke]

Changeset: daee9e92
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2022-04-08 10:50:12 +0000
URL:       https://git.openjdk.java.net/loom/commit/daee9e92f6d119fe6f8b2f10975caa40b9c60bfc

Add test to ensure exception thrown when not running with --enable-preview

! test/jdk/ProblemList.txt
+ test/jdk/java/lang/Thread/virtual/PreviewFeaturesNotEnabled.java