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This fixes opt/fehler318.c.

The computation of dominance might invalidate out edges.

This fixes opt/fehler319.c.

Dominance is computed explicitly later.

Otherwise repeatedly invoking be_main() leads to a double free.

They previously used be_stack_layout but that structure will be remove
soon.

We can just as well make up names on the fly while printing the entities
for debugging.

The soon to be introduced spillslot entities can be at negative offset,
so the previously used -1 as convention for invalid offsets is not a
good idea anymore.

The function also returns true for zero even though that is not a power
of two.

computed_value() uses some non-trivial patterns (Confirm nodes etc.)
that break the assumption that the transfer function only looks at its
direct operands.

This fixes opt/fehler313.c.

set_irn_link checks whether the resource is allocated.