+ 21.1.2002 Goetz
+ Added volatile flag to entity, order flag to array.
+ Added a set of assertions.
+
+ 17.1.2002 Goetz
+ Added access function set_class_members()
+
21.12.2001 Goetz
Asserts in irvrfy that verify the mode of Proj nodes. For Start,
Call, Return they check the corresponding function type! Corrected
bugs in testprograms.
+ Some asserts for legal values of 'pos' arguments in type/entity
+ access routines.
20.12.2001 Goetz
Some access routines for visited flags in entity.h, irnode.h,