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It was only used in one place, where it is easily replaced.

be_Return is no more.

This replaces ia32_ProduceVal/arm_EmptyReg. You should avoid using this
node in general, but there are some cases where you need it to fixup
nodes that are not register pressure faithful.

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.