8198560: Remove implicit casts from oop to JavaThread* and jlong* Reviewed-by: kbarrett, coleenp, tschatzl

8197780: Null pointer dereference in Klass::is_instance_klass of klass.hpp:532 Summary: Make generate_class_cast_message able to deal with NULL klass from the constant pool. Reviewed-by: hseigel, lfoltan

8198564: Multiple crashes on SPARC Reviewed-by: dholmes, simonis, stefank