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 typeinfo8;
extern(C) int printf(char*, ...);
struct S
{
    void func()
    {
    }
}

void main()
{
    S a;
    auto ti = typeid(typeof(&a.func));
    auto s = ti.toString;
    printf("%.*s\n", s.length, s.ptr);
    assert(s == "void delegate()");
}