70a03445f0
1. Added usad, umulhi, urhadd
2. Corrected implementation of __hadd, __hradd
3. TODO: __sad(). It gets tricky as ISA sees them as unsigned
Change-Id: Ibd2c2133b462f9393f3990355706386c79256bba
[ROCm/clr commit: 9ca135ac2e]