RFR: 8375544: JfrSet::clear should not use memset

[Markus Grönlund]

On Tue, 20 Jan 2026 17:38:57 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to JfrSet::clear to no longer use memset to clear
> the table data.  Instead use value-initialization, similarly to what is done
> in the set initialization from JDK-8374445.
> 
> Testing: mach5 tier1-3

Marked as reviewed by mgronlun (Reviewer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/29327#pullrequestreview-3686482632