Disable address fixup by default

[mkannwischer]

The address fixup as currently implemented sometimes breaks code if registers which are used for addresses are used in any other instruction than load and stores.

#95 added an option unsafe_address_offset_fixup to control if address fixup is enabled or not. Currently it is enabled by default, but that is dangerous and should be changed. However, that requires to changes a lot of examples

See

        # TODO: This should be False by default, but this is a breaking
        # change that requires a lot of examples (where it _is_ safe to
        # apply address offset fixup) to be changed.
        self._unsafe_address_offset_fixup = True

[mkannwischer]

Since #255 got merged, nothing is stopping us from making this change. Should be disable it by default now? How do we identify the examples that make use of offset fixup?