hg: jdk/sandbox: 8233500: Shenandoah: Shenandoah load barrier should save registers before calling keep alive barrier on x86

[chris.hegarty at oracle.com]

Changeset: 78aa7484c722
Author:    zgu
Date:      2019-11-26 14:33 -0500
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/78aa7484c722

8233500: Shenandoah: Shenandoah load barrier should save registers before calling keep alive barrier on x86
Reviewed-by: rkennke

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