To help the review of JDK-8260467, we make the mechanical changes like the following in this Subtask:

    SystemDictionary::Object_klass()
    SystemDictionary::Throwable_klass_is_loaded()
    SystemDictionary::box_klass_type()

to

    vmClasses::Object_klass()
    vmClasses::Throwable_klass_is_loaded()
    vmClasses::box_klass_type()

This will limit JDK-8260467 (which has the functional changes) to about 35 source files. This Subtask will change about 170 source files.