RFR: 8351673: Clean up a case of if (LockingMode == LM_LIGHTWEIGHT) in a legacy-only locking mode function

[Patricio Chilano Mateo]

On Tue, 11 Mar 2025 16:08:13 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> See title for description.
> Tested with tier1-4 with PR https://github.com/openjdk/jdk/pull/23981

LGTM.

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

Marked as reviewed by pchilanomate (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23990#pullrequestreview-2676043586