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 complex5;

void main()
{
    cfloat c = 3+2i;
    foo(c);
}

void foo(cfloat c)
{
    assert(c.re > 2.9999  && c.re < 3.0001);
    assert(c.im > 1.9999i && c.im < 2.0001i);
}