just pushed Richard's patch https://github.com/llvm-mirror/llvm/commit/36b9c09330bfb5e771914cfe307588f30d5510d2
tested with bcc and different bpf loaders. Thankfully none of them rely on old and arguably buggy em_none value, so no breakage expected. if you're using special bpf elf loader, please test. Thanks
