This is in preparation to reuse that code for amd64.

This prevents them from floating around and fixes backend/sparc_div.c.

This fixes backend/sparc_cmp3.c.

This can be used to effectively test aliasing in libfirm.

Also moved code into separate function.
This fixes backend/sparc_shr2.c.

= is_entconst(), is_typeconst, get_entconst_entity() and
get_typeconst_type()

The values used for offset were just plain wrong.

There was a lot of duplicated code, some changes in the templates allows
to share the two generators.

This fixes backend/sparc_cmp2.c.

Avoid "preparation" of export/import commands which baked in values like
the node name which might be changed in subclasses.
- Remove the builtin conversion table in favor of a simple rule to
  convert a C type to a function name part.