8157957: ClassNotFoundException: jdk.test.lib.JDKToolFinder
Reviewed-by: coleenp, gtriantafill, mseledtsov, iignatyev, dholmes, dsamersoff

8153737: Unsupported Module
Reviewed-by: alanb, mchung, psandoz

8079792: GC directory structure cleanup
Reviewed-by: brutisso, stefank, david