This reverts commit f56426a9.
Skipping a bitfields within a struct leads to wrong offsets.

This avoids problems where fixing Sels creates new Projs which must not
be changed. The previously broke valid cases in opt/structcall3.c for sparc.

Previously only valid identifier were accepted.

This fixes opt/fehler226.c.

Also adds accompanying bitset_t functions and unittests.

This API function is now also visible for the optimize variant.

This fixes opt/fehler225.c

This fixes opt/dwlower3.c.

This fixes opt/fehler223.c.

This partially reverts commit 81b27910.
The entry k_ir_max is used by liboo.

This fixes opt/loadstore4.c.

Directly call dump_entity_to_file()/dump_type_to_file() instead of throwing the kind away and calling show_firm_object().

Also remove show_firm_object(), because its only callers are gone now.

We need a consistent behaviour between irg_block_walk_graph and the
iredges block walk! This means we have to skip tuples like the
irg_block_walk_graph.

This fixes valgrind errors found in opt/fehler217.c

This fixes opt/fehler222.c.

The newly created nodes have no bitinfo so if we visiting them results
in a crash.

This should fix opt/fehler220.c

This should make the system to find/use alloca more robust.