8166276: Refactor gen_process_roots to allow simpler fix for 8165949 Reviewed-by: mgerdin, stefank Contributed-by: jesper.wilhelmsson@oracle.com, stefan.johansson@oracle.com

^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.hgtip
^.bridge2
^.jib/
.DS_Store
.metadata/
.recommenders/