R600/SI: Add SCC Defs/Uses to SOP1 and SOP2 opcodes
R600/SI: Add VI instructions
R600/SI: Update instruction conversions for VI

There are 3 changes:
- Convert 32-bit S_LSHL/LSHR/ASHR to their V_*REV variants for VI
- Lower RSQ_CLAMP for VI
- Don't generate MIN/MAX_LEGACY on VI