[RFC] vim-patch:7.4.167

Merging vim-patch:7.4.167

I mistakenly marked this patch as N/A in the wiki.

Problem:    Fixes are not tested.
Solution:   Add a test for not autoloading on assignment. (Yukihiro Nakadaira)

https://code.google.com/p/vim/source/detail?r=22387c8eec43ea8b1b704cad49c8f7187e2fd579