RFR: 8256156: JFR: Allow 'jfr' tool to show metadata without a recording [v14]

[Yi Yang]

On Thu, 11 Mar 2021 14:01:33 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

>> Yi Yang has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.
>
> Looks good. 
> 
> I still think the name of the test method should be called testWildcard() instead of testWildcardAndAcronym() since it is not testing acronyms, i.e using "GC" instead of "GarbageCollection", which is fine, but the name of the method should be appropriate.

Thank Erik for your patient and reviews. Your naming suggestion makes sense, I forgot to rename that method in the previous commit. Now it has been corrected.

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PR: https://git.openjdk.java.net/jdk/pull/1904