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Get away from the strange set_default_XXX_op style and instead let the
code modules register their node ops directly.

This also supports setting the initial node number to "rand", thereby
replacing randnodenr.

This also makes the compiler alot more deterministic avoiding, lots of
"random" jumping around in series of stores and loads.

I expect this to be a common pattern

The opt_manage framework didn't really do much except assuring that some
analysis info is computed before a pass starts. We can achieve this
simpler by providing an assure_irg_properties function.
This commit also fixes some places where analysis info was potentially
not invalidated before.

Noone was really using the return values anyway. This change makes the
API more consistent.

This makes it consistent with other firm analyse functions. Also removes
the unnecessary return value.

graph_properties are things that a transformation may destroy but which
can be easily recalculated.

graph_constraints are set after lowering phases have been running and
forbid certain constructs that no (later) transformation is allowed to construct