K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2019-11-20T19:43:34.657133Z
K 7
svn:log
V 336
Re-apply fixed r354847

unifdef(1): Improve worst-case bound on symbol resolution

Use RB_TREE to make some algorithms O(lg N) and O(N lg N) instead of O(N)
and O(N^2).

While here, remove arbitrarily limit on number of macros understood.

Reverts r354877 and r354878, which disabled the (correct) test.

PR:		242095
Reported by:	lwhsu

END