RFR: JDK-8290046: NMT: Remove unused MallocSiteTable::reset()

[Thomas Stuefe]

On Mon, 11 Jul 2022 13:45:21 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> Trivial cleanup. `MallocSiteTable::reset()` and `MallocSiteTable::delete_linked_list()` are not used anymore since [JDK-8256844](https://bugs.openjdk.org/browse/JDK-8256844). They can be removed.
>
> LGTM

Thanks @zhengyu123 and @DamonFool

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PR: https://git.openjdk.org/jdk/pull/9441