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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.

The common_transform stuff was meant to be reused by the PBQP code
selection which is not maintained anymore.

The only user should be an arch_add_irn_flags() instead.
It was harmless though, because no other flags were set.

Each Bad node has a proper mode now.

Rematerialisations involving multiple nodes and Projs (e.g. Proj->Load) got miscounted.
Now a rematerialization always counts as 1.

Resetting a node's schedule info and not properly removing it from the schedule is questionable anyway.

The node was just created, so it is not scheduled.

Since the prologue is added late, there are no Save nodes during transformation.

Since the epilogue is added late, there are no Leave nodes during transformation.

This is the same correction as for ia32.
First construct all epilogues, then the prologue.
Check there, whether the IncSP has no users and add a keep edge in that case.

If the start node was deleted, something is very wrong.