adapted to changes

Like the comment says "we can't have Bad-blocks".
However, optimize_cf does not remove them anymore.

[r28331]

[r28172]

[r28127]

[r28072]

[r28071]

[r28030]

[r28021]

[r28016]

[r28010]

eliminate the unnecessary and especially confusing concept of a 'code_generator' an isa-interface is enough

[r28009]

[r28008]

[r27992]

[r27989]

allow backend to specify endianess, rewrite bitfield emitter to handle little and big-endian byte order

[r27974]

[r27953]

backend is responsible for defining what lowering operations need to be performed => so the logical thing is to use a backend callback for performing lowerings

[r27938]

[r27836]

[r27740]

[r27726]

[r27703]

[r27693]

[r27692]

[r27691]

[r27690]