There are a number of places where WK_KLASS[Foo_klass] and SystemDictionary::Foo_klass() are cast to InstanceKlass* via InstanceKlass::cast, which is redundant since they already are InstanceKlass*.

Examples:

L2000: InstanceKlass::cast(WK_KLASS(Reference_klass))
L2029: InstanceKlass::cast(ClassLoader_klass())