Since we have no complicated barrier/prolog stuff in the transform phase
anymore we can move away from beabihelper now and create the nodes
directly which will be necessary when modeling special constraints like
wide aligned registers.

So sparc can handle this case now.

Use a special kind of entity on the frame type instead of a value_type
struct inside a method type. This makes replacement of function types
slightly easier (it's still a complex operation though) and handling in
the backend a bit more consistent since it's more or less a normal stack
access (with special offsets).

[r28346]

[r28340]

[r28127]