This fixes opt/fehler282.c.

This fixes opt/fehler281.c.

This fixes opt/fehler278.c.

Since safely iterating over out edges caches the next edges, we cannot
recursively move Proj nodes along with their operands.
If the Proj node is the cached one this causes the out edges to suddenly iterate
over another block.

This fixes opt/fehler279.c and opt/fehler280.c.

All backends emit nothing for Phis and be_Keeps, so set this centrally.

All backends have their own transformers.

irnode: When deciding to use an ARR_F for the in-array, check for oparity_dynamic instead of hard-coding End and Sync.

They are remnants from the first if-conversion implementation.

Most others were unused and removed already.
These three were used, but lost their meaning long ago when the users of the others were removed.

This also condenses double spaces at the end of verbose asm comments, which have no debug location.

The location of the value is more sensible than the location of the condition.

In comparsion with And + Add this saves one instruction, because we can keep the -1 and need no And.

All CopyBs and Stores have call_mem as operand, so having an explicit call_mem operand is unnecessary.

This fixes opt/fehler275.c.

This unifies several locally defined macros.