[Issue 23767] New: ImportC: ternary with null constant has wrong pointer type

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23767

          Issue ID: 23767
           Summary: ImportC: ternary with null constant has wrong pointer
                    type
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: ImportC
          Severity: normal
          Priority: P4
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dkorpel at live.nl

In a C ternary expression, when one expression is a pointer and the other is
the null pointer constant, the resulting type should be the pointer. This
compiles with GCC:
```
int arr[4];
void f(void)
{
    int x = *(0 ? (void*)0 : arr);
}
```

But with ImportC, it considers the type a void pointer and errors with:

```
Error: expression `*(0 ? cast(void*)0 : &arr)` is `void` and has no value
```

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