previous-history-element at switch-to-buffer prompt doesn't span full list

[Dan Jacobson]

Do C-x b M-p M-p M-n M-n etc.  Notice that it isn't going up and down
the full list of choices as would be seen from C-x b TAB, nor even a
reasonable subset.  E.g., files directly visited from dired buffers
wouldn't end up in that subset, well, anyway, it should loop directly
in the order of *Buffer list*, M-p going 1,2,3 M-n going Last,
Last-1... and both looping at the end, e.g. for M-p:  1 2 3 4 1 2 3 4.
By the way, too bad ^P ^N can't be used here, but I guess that's
reserved for 2 line buffer names :-)
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