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This removes the strange entity/type duality and we get rid of union symconst_symbol.

- Only allow get_entity_irg()/set_entity_irg() for method entities now.
- Allow setting/getting of additional properties for method and alias
  entities.
- Add some missing is_method_entity() checks in cgana.

Most firm analyses behaved incorrectlye when: A called SymConst did not
have a method entity, assumed the code reachable by get_entity_irg is
the code called. These assumptions are wrong when doing crazy casts in C
or when dealing with weak symbols. This is fixed by introducing some
convenience functions: get_Call_callee(), get_entity_linktime_irg()

It has been empty for nearly all systems. People who used to put stuff
in config.h can still create a config.h on their own and inject
-include (gcc) or /FI (msvc) into their CPPFLAGS.

- use c99 features
- no unexpected and unnecessary tuple removing/graph modifying
- translate some comments from german to english

Just state the copyright and the project the files belong to. You can
then find the COPYING file for the whole project.

cleanup: Remove pointless assert(is_${NODE}(x)) just before get_${NODE}_${FOO}(x), which do the same assert.

unknown_type, code_type, none_type, unknown_entity reference are hold in
the irprog now. This makes handling more consistent since now all types
and entities are equally part of irprog.

Replace with equivalent pset_ptr stuff

public functions are already documented in their headers, no need to
repeat the comment at the definition site.

this is part of the initiative to move object-orientation support stuff
out of libfirm into liboo

They have been unnecessary aliases for is_SymConst_addr_ent() and
get_SymConst_entity().

[r28375]

There seems to be no "open" methods at all (at least now, this concept seems
to be dead).

[r28368]

[r28338]

[r28272]

cgana() returns now the lenght of the free_methods array instead of
setting a passed pointer.

[r28263]

[r28127]

[r28037]

[r27182]

a new garbage collection pass less conservative than gc_irgs (but does not respect properties of object-oriented programs)

[r27056]

  clumsy. Bring back get_entity_visibility and set_entity_visibility

[r27039]

- Merge stickyness, visibility and variability into ir_linkage
- Add proper support for common symbols, weak symbols and C++ COMDAT stuff
- Mark OO-features type_visibility, peculiarity and allocation as deprecated
  OO feature will be separated from firm core into higher levels in the long run
- Rework, simplify and fix bugs in begnuas.c

[r27030]

[r26408]

[r26004]