RFR: 8309852: G1: Remove unnecessary assert_empty in G1ParScanThreadStateSet destructor

[Thomas Schatzl]

On Mon, 12 Jun 2023 13:31:20 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing redundant code.

Please copy&paste the description of the CR into the PR description for easier reference :)

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Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14417#pullrequestreview-1475109042