8185717: Make ModuleEntry->module() return an oop not a jobject Summary: Change ModuleEntry::module() to return an oop and add a ModuleEntry::module_handle() that returns a jobject Reviewed-by: shade, coleenp, lfoltan

^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
.DS_Store
.metadata/
.recommenders/