[PATCH] D24880: Add StringExtras join_items function

[Sanjoy Das via llvm-commits]

sanjoy added a subscriber: dblaikie.
sanjoy added a comment.

Looks fine to me, but I don't grok the intricacies of `std::forward` and variadic templates well enough to review this.  Perhaps @majnemer or @dblaikie can chime in?


https://reviews.llvm.org/D24880