RFR: JDK-8297215: Update libs tests to use @enablePreview [v4]

[Joe Darcy]

On Thu, 1 Dec 2022 19:19:01 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

>> Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Respond to review feedback.
>
> test/jdk/jdk/jfr/threading/TestDeepVirtualStackTrace.java line 46:
> 
>> 44:  * @modules jdk.jfr/jdk.jfr.internal
>> 45:  * @enablePreview
>> 46:  * @compile TestDeepVirtualStackTrace.java
> 
> Is compilation needed here?

For the two tests that compiled a single file, I remove the @compile directive. Any additional refactoring left for future work.

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PR: https://git.openjdk.org/jdk/pull/11222