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This is not really a new entity type but merely a relocation type.
Handle it with a x86_immediate_kind.

It is only passed around recursively.

This makes the code a bit clearer.

The idea here, is that you do not simply set a target operating system
or architecture, but have a setting for all things different between the
operating systems. Knowledge about the name and habits of the operating
system is left to the frontend.
(We may want to provide a small support library in the future to share
the triple parsing and OS -> settings code between multiple frontends).

* No \n at end; panic() adds one
* No punctuation mark at end
* Lowercase first letter

Previously a Bad node was returned which could hide problems and more
importantly you create new nodes (the BadBB) in an operation that apparently
only queries the graph.

This commit does:
- Remove tarval_reachable+tarval_unreachable, dataflow analysis rather
  use top/bottom instead of other special values.
- Rename tarval_undefined to tarval_unknown as it corresponds to the
  Unknown node (=a value which we don't know)
- Remove predefined tarval_top/tarval_bottom from tv.h and place the
  defines into combo.c
- Change compute_XXX constant folding functions to return tarval_unknown
  instead of tarval_bad if folding failed
- compute_Unknown in combo results in tarval_bottom == tarval_unknown
  this eliminates strange special cases in the Cond/Switch rules and the
  now unnecessary cprop_X list.

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.

It is not usefull for optimization in most languages:
- In C/C++ you can't really change the value of enum constants as casting
  from/to integer has to produce the expected results.
- In Java (and other OO languages) enum members are objects so the
  libfirm enumeration type can't be used there anyway

We do not model them as a type anymore, but simply annotate
compound_member entities with a bit offset and bit size.

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.