Mark N4508, LWG#2407, and LWG#2470 as complete. I don't see that 2470 requires any changes to the library.

llvm-svn: 241111
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: b138ae7cacf1732a2a03a6d71dc086ae77d4c49f
1 file changed