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This way we can express that the algos work on 32bit numbers only
instead of asserting that the unsigned type is 32bits wide.

This fixes backend/minus64.c.

This should fix C/bitfield4.c on leon.

This way it can be tested and used as an optimization in some places.

This fixes backend/sparc_finish.c.

This fixes backend/peephole.c.

This fixes backend/chordal.c.

This fixes opt/ifconv9.c.

You never know if the host long can hold enough values for the mode of
the target machine.

This fixes opt/dwlower2.c.