git: openjdk/jdk: 8255401: Shenandoah: Allow oldval and newval registers to overlap in cmpxchg_oop()

[Roman Kennke]

Changeset: 0e19ded9
Author:    Roman Kennke <rkennke at openjdk.org>
Date:      2020-11-02 16:01:18 +0000
URL:       https://github.com/openjdk/jdk/commit/0e19ded9

8255401: Shenandoah: Allow oldval and newval registers to overlap in cmpxchg_oop()

Reviewed-by: roland

! src/hotspot/cpu/aarch64/gc/shenandoah/shenandoahBarrierSetAssembler_aarch64.cpp
! src/hotspot/cpu/x86/gc/shenandoah/shenandoahBarrierSetAssembler_x86.cpp