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Just do the check in the corresponding implementation of arch_perform_memory_operand().

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

All backends have their own transformers.

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.

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

This fixes opt/fehler275.c.

This unifies several locally defined macros.

This is simpler and does not require queueing them anymore.

This is in preparation for a removal of the generic arch_irn_flag_modify_flags