hg: jdk/jdk: 8237837: Shenandoah: assert(mem == __null) failed: only one safepoint

[rwestrel at redhat.com]

Changeset: a42cdcd11ca4
Author:    roland
Date:      2020-01-28 11:28 +0100
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/a42cdcd11ca4

8237837: Shenandoah: assert(mem == __null) failed: only one safepoint
Reviewed-by: rkennke

! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp
+ test/hotspot/jtreg/gc/shenandoah/compiler/BarrierInInfiniteLoop.java