[Issue 24409] New: DMD crash for CTFE in stompOverlappedFields

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24409

          Issue ID: 24409
           Summary: DMD crash for CTFE in stompOverlappedFields
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: tim.dlang at t-online.de

DMD tries to access a null pointer in stompOverlappedFields for the following
code:
```
static struct S
{
    union
    {
        int i;
        long l;
    }
}

int f()
{
    S* r = new S();
    r.i = 5;
    return r.i;
}

enum X = f();

```

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