8211211: vmTestbase/metaspace/stressDictionary/StressDictionary.java timeout
Summary: Disable CMS precleaning to avoid accumulating too many classloaders to unload.
Reviewed-by: kbarrett, sangheki
/build/
/dist/
/.idea/
nbproject/private/
/webrev
/.src-rev
/.jib/
.DS_Store
.metadata/
.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
**/JTreport/**
**/JTwork/**