Backport PR
#2849: utils/data: Use list comprehension for uniq_stable()...
Backport PR
#2849: utils/data: Use list comprehension for uniq_stable()
This should be faster than and explicit for loop. Also, a set makes more
sense than a dict if we only care about values. After these changes, the
resulting code is the same as Dave Kirby's uniqify() suggestion on Peter
Bengtsson's blog [1].
[1]:
http://www.peterbe.com/plog/uniqifiers-benchmark