git: openjdk/jdk-sandbox: shen-late-barriers: Remove LRB null-checks from x86_64 as well

[duke]

Changeset: 4906488b
Branch: shen-late-barriers
Author:    Aleksey Shipilev <aleksey at shipilev.net>
Date:      2025-11-24 13:29:11 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/4906488b19dd3376ce628926fb8f311b6c29686f

Remove LRB null-checks from x86_64 as well

! src/hotspot/cpu/x86/gc/shenandoah/shenandoahBarrierSetAssembler_x86.cpp