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 scope5;

int i;

void func(int a, int b)
{
    i = 0;
    {
        scope(exit) i++;
        if (a) {
            scope(exit) i++;
            if (b) return;
            i++;
        }
    }
    i++;
}

void main()
{
    func(0,0);
    assert(i == 2);
    func(1,1);
    assert(i == 2);
    func(1,0);
    assert(i == 4);
}