[PATCH] D42556: [InlineCost] Mark functions accessing varargs as not viable.

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

(The original patch didn't make it into 6.0, so we don't need to cherry-pick this, I think.)

Do we need to check for musttail calls, since they can also access varargs?


https://reviews.llvm.org/D42556