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It is barely used but cross cuts into most libfirm components and
therefore isn't maintenance free.

The statev framework stays obviously.

We can see that we need a frame entity if the the immediate has a
X86_IMM_FRAMEOFFSET relocation but no entity assigned yet.

Maybe we should also rename "opt" to "trans" in the future...

Just use the code present in the Cmp/Sub-optimization to see if it will
trigger.

This fixes opt/fehler304.c

This unifies the behavior in debug and optimize build, since
be_set_transformed_node also marks the node as visited.
Furthermore, nobody should call be_is_transformed for the current node,
since this would mean we ran into a cycle (which is covered by an assert in the
debug build).

Heights are the longest chain of users, not operands, in the block.
Therefore the after nodes all have the same height of 0, because they
have no users, yet.

This fixes several tests on SPARC.

The functions were all dealing with graphs so ir/ir is a more logical
place to be.