git: openjdk/jdk: 8309956: Shenandoah: Strengthen the mark word check in string dedup

[Aleksey Shipilev]

Changeset: 57b82512
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2023-06-14 16:57:15 +0000
URL:       https://git.openjdk.org/jdk/commit/57b8251241e2044d5039ce162bf4637a9b2e5466

8309956: Shenandoah: Strengthen the mark word check in string dedup

Reviewed-by: wkemper, zgu, ysr

! src/hotspot/share/gc/shenandoah/shenandoahStringDedup.inline.hpp