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.

module multiarr1;

void main()
{
    int[16][16] a;
    assert(a[0][0] == 0);
    assert(a[0][1] == 0);
    assert(a[0][2] == 0);
    assert(a[0][3] == 0);
    assert(a[10][13] == 0);
    assert(a[15][15] == 0);
    a[10][13] = 42;
    assert(a[0][0] == 0);
    assert(a[10][13] == 42);
    assert(a[15][15] == 0);
    {
        int* l = cast(int*)a;
        l += 10*16+13;
        assert(*l == 42);
    }
}