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Add callbacks on functions that really need them instead.

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

All other structs holding a register class call it cls, too.

Just do the check in the corresponding implementation of arch_perform_memory_operand().

- alignment is set on each single IncSP now instead of a global arch_env
  setting
- fixed ia32 not requesting any alignment anymore (even on darwin where
  we need it)
- fixed amd64 creating IncSP nodes without flag_modifies_flags set

The previous approach put the irg link into the block attributes, so
while saving memory an extra indirection was necessary. Some testing
with valgrind massif+callgrind revealed that a direct link increses peak
memory usage by ~1% while also increasing runtime by ~1%. More
importantly the code gets a bit simpler and some strange corner cases can be
removed with the direct link.

Make the list scheduler a set of helper functions, instead of a complex
design with a set of callbacks.
Simplified list scheduler code.

Most uses in the backend should be mode_is_data() the few remaining uses
can compare with mode_b explicitely.

All users of NEW_ARR_A used it to construct a simple array, yet noone
cared about it actually being an array with a length field in front. For
this simple use case you should use ALLOCAN.

Due to the bug, the opcode name of phi nodes are never printed in the
first dump of the backend (...-begin.vcg).

As they were just a single flag the name should reflect that. I did not
change arch_irn_flags_none, as that is not about a single flag.

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.