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

[Jie Fu]

On Sun, 10 Jul 2022 05:55:25 GMT, Thomas Stuefe <stuefe 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.

Looks good.

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Marked as reviewed by jiefu (Reviewer).

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