Remove an old workaround that was kept around for ABI-compatibility on x86-64 between different LLVM versions. This means LLVM r67588 is required if you want to compile for x86-64, otherwise the backend will assert when you try to return e.g. struct { int i; char c; } from a function. (In particular, this is no longer compatible with LLVM 2.5) It also means that any code returning small structs on x86-64 will probably need to be recompiled in order to be linkable to code compiled with this change.

extern(C) int printf(char*, ...);

int main()
{
    char[16] s = void;
    {
    char[] sd = s;
    {
    s[0] = 'a';
    s[1] = 'b';
    s[2] = 'c';
    }

    printf("%p %p\n", s.ptr, sd.ptr);
    printf("%c%c%c\n", s[0], s[1], s[2]);
    }

    char[16] s1 = void;
    char[16] s2 = void;
    char[] d1 = s1;

    {
        printf("%p\n%p\n%p\n", s1.ptr, s2.ptr, d1.ptr);
    }

    int[16] arr;

    return 0;
}