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 vararg3;

import tango.core.Vararg;

void func(...)
{
    assert(_arguments.length == 3);
    assert(_arguments[0] is typeid(int));
    assert(_arguments[1] is typeid(float));
    assert(_arguments[2] is typeid(long));
    assert(va_arg!(int)(_argptr) == 4);
    assert(va_arg!(float)(_argptr) == 2.5f);
    assert(va_arg!(long)(_argptr) == 42L);
}

void main()
{
    func(4, 2.5f, 42L);
}