Build fails when cds is disabled after JDK-8247536

# Reproduce
```
bash configure --disable-cds ...
```

# Symptom
```
* For target hotspot_variant-server_libjvm_objs_jvm.o:
./src/hotspot/share/prims/jvm.cpp:3872:41: error: use of undeclared identifier 'classlist_file'
  return DumpLoadedClassList != NULL && classlist_file != NULL && classlist_file->is_open();
                                        ^
./src/hotspot/share/prims/jvm.cpp:3872:67: error: use of undeclared identifier 'classlist_file'
  return DumpLoadedClassList != NULL && classlist_file != NULL && classlist_file->is_open();
                                                                  ^
2 errors generated.
```