hg: jdk/jdk: 8221509: Refactor assert( G1CollectedHeap::used() == recalculate_used() ) with better message

[sangheon.kim at oracle.com]

Changeset: 671e35cf611b
Author:    sangheki
Date:      2019-05-06 14:19 -0700
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/671e35cf611b

8221509: Refactor assert( G1CollectedHeap::used() == recalculate_used() ) with better message
Reviewed-by: tschatzl, manc

! src/hotspot/share/gc/g1/g1CollectedHeap.cpp
! src/hotspot/share/gc/g1/g1CollectedHeap.hpp
! src/hotspot/share/gc/g1/g1Policy.cpp