RFR(XS) 8191585 VM anonymous classes created during CDS dump time cause crash

[Ioi Lam]

Hi,

Please review this small VM change and the corresponding test case.

https://bugs.openjdk.java.net/browse/JDK-8191585
http://cr.openjdk.java.net/~iklam/jdk11/8191585-vm-anon-classes-cause-dumping-crash.v01/

The crash happens in the following code:

class CombineDictionariesClosure : public CLDClosure {
     void do_cld(ClassLoaderData* cld) {
       if (cld->is_system_class_loader_data() || 
cld->is_platform_class_loader_data()) {
         for (int i = 0; i < cld->dictionary()->table_size(); ++i) {
                                  ^^^^^^^^^^^ == NULL

The bug is in cld->is_system_class_loader_data() -- the CLD of anon 
classes have a NULL
cld::dictionary(), but its cld::class_loader() returns the loader object 
of the holder
class.

The fix is to reject if cld::is_anonymous() is true.

Thanks
- Ioi