[llvm] [RISCV][VLOPT] Get MachineInstr from MachineOperand in getOperandInfo. NFC (PR #119838)

[Michael Maitland via llvm-commits]

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@@ -206,9 +206,9 @@ static bool isMaskOperand(const MachineInstr &MI, const MachineOperand &MO,
 }
 
 /// Return the OperandInfo for MO, which is an operand of MI.
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michaelmaitland wrote:

nit: drop `which is an operand of MI`?

https://github.com/llvm/llvm-project/pull/119838