This reverts commit 29d319c7

.

Now that we use nir_lower_bool_to_bitsize, we don't see 1-bit booleans
anymore, so the issue this fixed doesn't apply. Actually, that issue was
(in part) why I started looking into boolean handling in the first
place.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>