r600/sfn: Add algebraic lowering for fsin and fcos

r600/sfn: Add algebraic lowering for fsin and  fcos

* fsin and fcos require normalization of the input
* bitfield_insert requires an additional shift of the insert value

v2: drop bitfield_insert lowering code, it is already avaibable as
    compiler option (Rhys Perry)

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Kristian H. Kristensen <hoegsberg@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9452>