[aarch64-port-dev ] git: openjdk/aarch64-port: master: 8278826: Print error if Shenandoah flags are empty (instead of crashing)

[Dmitry Chuyko]

Changeset: 247ea71d
Author:    Dmitry Chuyko <dchuyko at openjdk.org>
Date:      2021-12-17 09:19:00 +0000
URL:       https://git.openjdk.java.net/aarch64-port/commit/247ea71d24a251d29d9a5179e5b773df850e7261

8278826: Print error if Shenandoah flags are empty (instead of crashing)

Reviewed-by: rkennke, mli

! src/hotspot/share/gc/shenandoah/mode/shenandoahIUMode.cpp
! src/hotspot/share/gc/shenandoah/mode/shenandoahPassiveMode.cpp
! src/hotspot/share/gc/shenandoah/mode/shenandoahSATBMode.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp