Wyatt Allen cdb8a43f76 More efficient thread grouping
A nested loop made ChangeComments#getCommentThreads O(n²) in the worst
case. Use a map to convert it to O(n).

Change-Id: I39f6a462cdd23316a1b513ebf98bbd2c8f9aaec2
2018-04-04 23:31:11 -07:00
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