[Issue 24456] New: CTFE implicit conversion to void[] produces wrong length

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24456

          Issue ID: 24456
           Summary: CTFE implicit conversion to void[] produces wrong
                    length
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: Bastiaan at Veelo.net

```
void check(void[] v, size_t len) 
{
    import std.conv;

    assert(v.length == len,
           "v.length is " ~ v.length.to!string ~
           ", expected " ~ len.to!string);
}

int implicitConversion()
{
    int[2] arr;
    check(arr, 8);
    return 42;
}

int noConversion()
{
    ubyte[8] arr;
    check(arr, 8);
    return 42;
}

struct S
{
    int i = implicitConversion; // Error: "v.length is 2, expected 8"
    int j = noConversion; // Fine
}

void main()
{
    int i = implicitConversion; // Fine
    int j = noConversion; // Fine
}
```

This problem surfaced while trying do statically initialize an instance of
std.bitmanip.BitArray.

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