Don't allocate a buffer to return a reference to a tuple element

Don't allocate a buffer to return a reference to a tuple element

If we're returning a reference to an object because we don't have a
clone function available, we'll set the reference flag implying no
free'ing will occur. In that case, we don't need to allocate a
buffer to copy the object's memory, we might as well just return a
pointer to the original.

After this commit, test leaks are:
    73 allocations remained for 1137376 bytes.