git: openjdk/jdk-sandbox: shen-late-barriers: Implement missing SBSC2::estimate_barrier_size

[duke]

Changeset: 2ffc2be1
Branch: shen-late-barriers
Author:    Aleksey Shipilev <aleksey at shipilev.net>
Date:      2026-02-13 17:08:27 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/2ffc2be13cddd39e073d0d582e978ead0b8a3300

Implement missing SBSC2::estimate_barrier_size

! run-helloworld.sh
! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.hpp