Add collation operator

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Workaround for segfault

Archive currently triggers a segfault with the addition of these two
postfix operators. The bug has been reported to Apple with
<rdar://18825175> and this commit acts as a less-than-DRY workaround in
the meantime.

Reported-by: Ferran Vilà Conesa <@fnva>
Signed-off-by: Stephen Celis <stephen@stephencelis.com>