Output labels when disassembling code

This addresses <https://github.com/JuliaLang/julia/issues/6589>.

This handles only the LLVM33 non-MCJIT case. Addressing the other cases seems straightforward, but I currently can't test them locally.

Thanks for catching this, that's just leftover debug output. Since the actual disassembled output is cached, cout output appears above, making it easy to miss.