Incorrect location for undefined identifier in alias template instantiation

```
enum plusOne(int x) = x + 1;
struct xyz{}

alias PlusOne =
  plusOne
  !
  xyx;
```

Outputs:

```
test.d(4): Error: undefined identifier `xyx`, did you mean struct `xyz`?
    plusOne
    ^
```
The error should be on line 6, pointing `xyx`.
