Named function in design fails to evaluate.

When a named function is used for a design function, the server
generates a Error: compilation_error.

To reproduce this, create a view function that has a map function that
looks like this:

function name(doc) {
  emit(doc._id, doc);
}

This can be mitigated by not uploading named functions of course,
but sometimes this is harder than it seems (when using libraries to
do the uploading for example).

Also, named functions are technically equivalent to anonymous functions
so they should work.