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 mini.arrays20;

int[] foo()
{
    return [2,4,6];
}

int[] bar()
{
    return [1,3,5];
}

void main()
{
    auto a = foo();
    auto b = bar();
    assert(b[0] == 1);
    assert(a[0] == 2);
    assert(b[1] == 3);
    assert(a[1] == 4);
    assert(b[2] == 5);
    assert(a[2] == 6);
}