BUG: CC0014 converts if y then x += 1 else x =1 to x +=(if(y, 1, 1)

# Bug

In cases where one branch of an if increments a variable and the other assigns a value to it then CC0014 should not offer a fix.

``` vb.net
Dim s As String
If True Then
    s += "a"
Else
    s = "b"
End If
```

Current output after fix applied:

``` vb.net
s += If(True, "a", "b")
```

Fix should go to branch `v1.0.x`.

@bergarces is working on it.