[RISCV][ISel] Fix types in `tryFoldSelectIntoOp` (#90659)

```
SelectionDAG has 17 nodes:
  t0: ch,glue = EntryToken
    t6: i64,ch = CopyFromReg t0, Register:i64 %2
  t8: i1 = truncate t6
          t4: i64,ch = CopyFromReg t0, Register:i64 %1
        t7: i1 = truncate t4
            t2: i64,ch = CopyFromReg t0, Register:i64 %0
          t10: i64,i1 = saddo t2, Constant:i64<1>
        t11: i1 = or t8, t10:1
      t12: i1 = select t7, t8, t11
    t13: i64 = any_extend t12
  t15: ch,glue = CopyToReg t0, Register:i64 $x10, t13
  t16: ch = RISCVISD::RET_GLUE t15, Register:i64 $x10, t15:1
```

`OtherOpVT` should be i1, but `OtherOp->getValueType(0)` returns `i64`,
which ignores `ResNo` in `SDValue`.

Fix https://github.com/llvm/llvm-project/issues/90652.