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Except for two users, all users add 1 immediately anyway.
Of the two exceptions one of them (in kill_unused_stacknodes()) is wrong, so this is now corrected.
The other one is exchange(), which now just uses ->in, which is fine, since it handles node interna anyway.

This fixes backend/sparc_mode.c on SPARC and ARM.

Now the ls_mode is respected by default, wich is more sensible, and '#' is used to emit a 32 bit register.

This also fixes a possible null pointer access.

This fixes opt/reassoc033.c.

This fixes opt/fehler310.c.

This fixes opt/fehler312.c.

This fixes opt/fehler308.c.

This fixes opt/fehler311.c.

When distributing Conv over a Sub, build a new Sub, not an Add.

We now restart the optimization as soon as we changed an operand or the
relation. This makes the whole optimization less error-prone.

This fixes opt/fehler309.c.

This allows the use the function in more cases.

The involved conversion are all same size and won't create extra target
instructions. So we can safely perform the transformtion at the Add/Sub
level to get a normalizing effect. This also fixes a problem where an
AddP was constructed with the wrong offset_mode.

This fixes firm-testsuite/opt/fehler307.c