RFR: 8284549: JFR: FieldTable leaks FieldInfoTable member

[Zhengyu Gu]

On Fri, 8 Apr 2022 09:38:56 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> `FieldTable` is a `ResourceObj` and it has a member points to `FieldInfoTable`, which is a `CHeapObj`.
>> 
>> Since ResouceObj's destructor is never called, so it can not depend on `FieldTable`s destructor to  free `FieldInfoTable`, it needs to be freed explicitly.
>
> Looks good, thanks.

Thanks for the review, @mgronlun

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PR: https://git.openjdk.java.net/jdk/pull/8149