[Issue 20774] New: Static arrays passed as dynamic arrays over varargs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20774

          Issue ID: 20774
           Summary: Static arrays passed as dynamic arrays over varargs
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

This causes a mismatch between the caller and va_arg.

Sample program:

```
void testVariadic(T)(int nargs, ...)
{
    import std.stdio;
    foreach(i; 0 .. nargs)
    {
        auto arg = va_arg!T(_argptr);
        writeln(arg);
    }
}

alias StaticArray = int[4];

void test7()
{
    StaticArray a0 = 0;
    StaticArray a1 = 1;
    StaticArray a2 = 2;
    testVariadic!StaticArray(3, a0, a1, a2);
}

```

This prints:
[4, 0, -1008992768, 32764]
[4, 0, -1008992736, 32764]
[4, 0, -1008992704, 32764]

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