hg: jdk/sandbox: 8242597: Remove GenericTaskQueue<>::push_slow

[chris.hegarty at oracle.com]

Changeset: 9aea61e73814
Author:    kbarrett
Date:      2020-04-15 03:05 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/9aea61e73814

8242597: Remove GenericTaskQueue<>::push_slow
Summary: Remove push_slow and comment invariants.
Reviewed-by: tschatzl, iwalulya

! src/hotspot/share/gc/shared/taskqueue.hpp
! src/hotspot/share/gc/shared/taskqueue.inline.hpp