This patch simply updates the release notes for libc++ 9.0. I have
picked out a few featues/fixes/updates that I think are worth
mentioning. Feel free to suggest changes, or simply leave a comment with
something that should be added and I will update this patch.
This seems misleading if it refers to my llvm version bump? The runtime is compiled with llvm so it’s true there, but users of older GCC should still be able to use the libc++ headers I think.