Float affected commands to the top

[elliotgoodrich]

https://www.reddit.com/r/cpp/comments/1g3atxr/comment/lrv1a3c/

Assuming that ninja will build earlier commands first (need to check with 1.12.1 and the critical path scheduling) then we should float affected commands higher up on the output so that they are built first. If there is a mistake in a change then we get feedback much faster.