[RISCV] Use unsigned instead of uint16_t for the Opcode argument to getVectorLowDemandedScalarBits. NFC

All the callers pass an unsigned and uint16_t arguments are unusual.

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfo.cpp

@@ -4581,7 +4581,7 @@ bool RISCV::hasEqualFRM(const MachineInstr &MI1, const MachineInstr &MI2) {
 }
 
 std::optional<unsigned>
-RISCV::getVectorLowDemandedScalarBits(uint16_t Opcode, unsigned Log2SEW) {
+RISCV::getVectorLowDemandedScalarBits(unsigned Opcode, unsigned Log2SEW) {
   switch (Opcode) {
   default:
     return std::nullopt;

llvm/lib/Target/RISCV/RISCVInstrInfo.h

@@ -364,7 +364,7 @@ bool hasEqualFRM(const MachineInstr &MI1, const MachineInstr &MI2);
 // If \p Opcode is a .vx vector instruction, returns the lower number of bits
 // that are used from the scalar .x operand for a given \p Log2SEW. Otherwise
 // returns null.
-std::optional<unsigned> getVectorLowDemandedScalarBits(uint16_t Opcode,
+std::optional<unsigned> getVectorLowDemandedScalarBits(unsigned Opcode,
                                                        unsigned Log2SEW);
 
 // Returns the MC opcode of RVV pseudo instruction.