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Just use the selected isa interface directly.

* Classify ',' as "no support" instead of "invalid".
* Ignore '!' and '?'.

* GCC does this, too.
* This is sensible, because they apply to all alternatives of a multi-alternative constraint.
* This simplifies the implementation and makes some flags obsolete.

This unifies several locally defined macros.

- Only iterating over the graph once should be slightly faster
- We don't need to insert the middle of register allocation logic but
  can perform it once before.
- We can gather statistics on the prepared graph before spilling/regalloc has
  happened.

Note that for OO code you should use liboo which provides the same
features!

This allows the fronted to register a dump+verify callback for the
lowering transformations performed by the backends.

The new code has less options and variants, if you call irg_verify()
verification is performed, regardless of DEBUG_libfirm, or NDEBUG being
set and regardless of firm verification setting switches. On the other
side no atomic dump and abort is performed anymore, the call has to do
this, though an irg_assert_verify() function has been added as a
convenience measure.
There has also been a complete rewrite of the actual checking performed.
The new code is simpler, should produce more consistent output and
can report more than one error.

No need to do it in backend preparation phase, if some backends destroy
the property again before transformation.

- The backends can simply perform the finish_graph() steps in the emit()
  phase.