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some were missing anyway and nobody is using the global declarations anyway

The cfopt itself can handle unreachable code,
but it transforms it in a way that makes the verifier unhappy.

- Make API private as it should only be called by backends
- Let ia32 backend create special ia32_Set nodes instead of relying
  on muxes which must not be touched anymore
- Does not create ConvB nodes anymore but instead produces the Cmp
  directly. (All backends did this anyway during code-selection so I was
  able to leave this case out code-selection)
- First collect nodes to lower, then lower them. This avoids robustness
  problems when transforming the graph while at the same time walking
  it.

Some backends create nodes in their lower_for_target phases already.
These nodes are placeholders for real backend nodes later, in contrast
they do not have register requirements or backend attributes. Simplified
this by allowing custom dumpers for them and leaving out the backend
node structs.

This fixes opt/fehler202.c.

This is a merge, because it should be considered as a single commit
and libFirm might be broken between the various commits of the branch.
However, there are so many changes, that i do not want to squash
them all into one mega-commit.

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