git: openjdk/jdk8u-dev: 8237479: 8230305 causes slowdebug build failure

[Jonathan Dowland]

Changeset: 362cf762
Author:    Jonathan Dowland <jdowland at openjdk.org>
Date:      2022-12-08 20:20:54 +0000
URL:       https://git.openjdk.org/jdk8u-dev/commit/362cf7628b73f4112bee464cea52a8a29e6671ce

8237479: 8230305 causes slowdebug build failure

Declare methods as pure virtual.

Reviewed-by: sgehwolf, andrew
Backport-of: 4ca06995855b5c974321d7b3622d661b8d27ba76

! hotspot/src/os/linux/vm/cgroupSubsystem_linux.hpp