[PATCH] D31622: Avoid sub shell

[Reid Kleckner via Phabricator via llvm-commits]

rnk accepted this revision.
rnk added a comment.
This revision is now accepted and ready to land.

lgtm

I was thinking that the alternative fix would be to add a flag to `not` like `not --dont-care diff a.txt b.txt | grep "^<"`, but this works.


https://reviews.llvm.org/D31622