hg: jdk/jdk: 8243325: Cleanup TaskQueueSuper<>::peek

[kim.barrett at oracle.com]

Changeset: 871e0be28aed
Author:    kbarrett
Date:      2020-05-06 00:23 -0400
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/871e0be28aed

8243325: Cleanup TaskQueueSuper<>::peek
Summary: Replaced uses of peek with new assert_empty.
Reviewed-by: tschatzl, sjohanss

! src/hotspot/share/gc/shared/taskTerminator.cpp
! src/hotspot/share/gc/shared/taskTerminator.hpp
! src/hotspot/share/gc/shared/taskqueue.hpp