hg: shenandoah/jdk: Shenandoah: SBSA::load_at() should save/restore registers when calling SATB barrier

[zgu at redhat.com]

Changeset: 06904b2b3b0f
Author:    zgu
Date:      2019-10-07 17:50 -0400
URL:       https://hg.openjdk.java.net/shenandoah/jdk/rev/06904b2b3b0f

Shenandoah: SBSA::load_at() should save/restore registers when calling SATB barrier
Reviewed-by: rkennke

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