8178380: Module system implementation refresh (5/2017)
Reviewed-by: lfoltan, hseigel, mchung, sspitsyn
Contributed-by: alan.bateman@oracle.com, serguei.spitsyn@oracle.com

8174856: [TESTBUG] Missing DefineClass instances
Reviewed-by: dholmes, ddmitriev

8173743: Failures during class definition can lead to memory leaks in metaspace
Reviewed-by: dholmes, coleenp, acorn, ddmitriev