[PATCH] D55045: Add a version of std::function that includes a few optimizations.

[Louis Dionne via Phabricator]

ldionne requested changes to this revision.
ldionne added a comment.
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I'd like to see benchmarking results that show the benefit of this approach.

Also, it's not clear to me that trying to "merge" the two implementations is the right choice. Maybe we want a straight up different implementation (i.e. replace `std::function` as a whole instead of having many `#ifdef`s in the existing `std::function`).


Repository:
  rCXX libc++

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  https://reviews.llvm.org/D55045/new/

https://reviews.llvm.org/D55045