GBE: fix a bug for the cast(FPToUI) instruction.
GBE: fix a bug for the cast(FPToUI) instruction.

We need to choose unsigned dst type for this case.

v2:
fix a typo.

Signed-off-by: Zhigang Gong <e04a7b9b70b1e4c6318cf117dcd1a9056e14b97a@linux.intel.com>
Reviewed-by: "Xing, Homer" <f17cb7083eb6a94c3fb9d8f09ceefa518f721ab2@intel.com>

freedesktop-unofficial-mirror/beignet,ignatenkobrain/beignet,ignatenkobrain/beignet,wdv4758h/beignet,zhenyw/beignet,zhenyw/beignet,zhenyw/beignet,freedesktop-unofficial-mirror/beignet,zhenyw/beignet,ignatenkobrain/beignet,wdv4758h/beignet,freedesktop-unofficial-mirror/beignet,wdv4758h/beignet,freedesktop-unofficial-mirror/beignet,wdv4758h/beignet,ignatenkobrain/beignet,wdv4758h/beignet,ignatenkobrain/beignet,zhenyw/beignet