hg: jdk/jdk: 8217385: JTREG: Clean up, make sure to close resources

[leo.korinth at oracle.com]

Changeset: 88b84fc64d34
Author:    lkorinth
Date:      2019-02-18 10:48 +0100
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/88b84fc64d34

8217385: JTREG: Clean up, make sure to close resources
Reviewed-by: tschatzl, sangheki

! test/hotspot/jtreg/gc/g1/humongousObjects/TestHumongousClassLoader.java
! test/hotspot/jtreg/gc/g1/plab/lib/LogParser.java
! test/hotspot/jtreg/gc/stress/gcbasher/TestGCBasher.java