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This fixes several tests on ARM.

Since safely iterating over out edges caches the next edges, we cannot
recursively move Proj nodes along with their operands.
If the Proj node is the cached one this causes the out edges to suddenly iterate
over another block.

This fixes opt/fehler279.c and opt/fehler280.c.

This fixes opt/fehler268.c and opt/fehler272.c.

The start block is not special block without any "real" instructions
anymore. In particular this means:

- There is no X_initial_exec Proj from the Start node anymore, "normal"
  cfopts are used for jumping out of the start block.
- The backend never had the special convention of the start block not
  containing actual code and used to fixup this discrpancy, no more
  fixup code needed now.
- The part_block() code got a bit more complicated because splitting the
  start block is tricky (previously part_block() simply failed in this
  case but was never used in the Start block because of its special
  convention)

This makes our usage of PhiMs to represent the observable behaviour of
non-terminating loops more obvious.
Having an explicit loop Phi constructor also fixes problems with Phi
getting optimized before the keep edge was added.

Settle on 1 flag type and no different I_FLAG and E_FLAG

- Compound type selection is performed with Member
- Array indexing is performed with Sel
- Instead of the simpleSel constructor functions you can use the normal Member
  constructors now
- The concept of array element entities has been removed, Sel nodes just
  contain a pointer to the array type now.

Deduce the mode automatically from the given entity.

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

also move copy_const_value from typerep/entity to irgmod.

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.

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

irgmod: Pass the new inputs to turn_into_tuple() instead of initialising them with Bad and setting them afterwards.

graph_properties are things that a transformation may destroy but which
can be easily recalculated.

graph_constraints are set after lowering phases have been running and
forbid certain constructs that no (later) transformation is allowed to construct

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

API change: removes set_irg_outs_inconsistent and get_irg_outs_state
Use set_irg_state and is_irg_state instead!

when calling exchange, set_irn_n, or set_irn_in.

fixes backend/inconsistent_outs test case

[r28127]