git: openjdk/mobile: 8244307: Improve assertions against taskqueue underflow

[duke]

Changeset: 98d41015
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2020-05-06 00:28:12 +0000
URL:       https://git.openjdk.java.net/mobile/commit/98d41015

8244307: Improve assertions against taskqueue underflow

Added assert_not_underflow.

Reviewed-by: tschatzl, sjohanss

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