+ 27.2.2001 Goetz
+ Moved struct from irprog.h to irprog_t.h
+
+ 25.1.2001 Goetz
+ After compacting of in arrays in dead_node_elimination
+ merge blocks and remove Phis with one pred.
+
+ 24.1.2001 Goetz
+ Freeing of obstack in dead_node_elimination commented in.
+ Compacting in arrays of Block and Phi nodes in dead_node_
+ elimination.
+ Some more changes...
+
+ 15.01.2001 Goetz
+ added set/get_SymConst_type_or_id in irnode.h
+ added field offset to entity in entity.h
+ added field size to type_class in type.h
+ include "gmp.h" in tv.h with "" instead <>
+
+ 12.01.2001 Goetz
+ Some changes to make the lib better portable
+
+ 29.12.2000 Goetz
+ Initialize max_node_nr in irprog.
+
+ 27.12.2000 Goetz
+ Now outputs warning if faulty type in irdump, dump_type_info.
+ Explicit string termination in irdump, vcg_open.
+
20.12.2000 Goetz
Added external to declaration of irp.
Added typedef before pns and pnc_number.