[llvm] [RISCV][VLOPT] Handle tied pseudos in getOperandInfo (PR #123170)

[Pengcheng Wang via llvm-commits]

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@@ -568,7 +569,8 @@ getOperandLog2EEW(const MachineOperand &MO, const MachineRegisterInfo *MRI) {
   case RISCV::VFWADD_WV:
   case RISCV::VFWSUB_WF:
   case RISCV::VFWSUB_WV: {
-    bool IsOp1 = HasPassthru ? MO.getOperandNo() == 2 : MO.getOperandNo() == 1;
+    bool IsOp1 = (HasPassthru && !IsTied) ? MO.getOperandNo() == 2
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wangpc-pp wrote:

I am inclined to use another name instead of `IsOp1` because it doesn't make sense here, `IsVS1` seems to be more suitable.
Since there are more other cases, this can be a NFC follow-up. :-)

https://github.com/llvm/llvm-project/pull/123170