[Issue 18645] DMD segmentation fault

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18645

--- Comment #1 from Mihails Strasuns <mihails.strasuns.contractor at sociomantic.com> ---
This crashes 2.079 and 2.078, but compiles on 2.071 (haven't checked versions
in between yet):

```
enum A
{
    x = global,
    y
}

static global = INIT;

immutable INIT = 42;
```

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