[clang] [lldb] [llvm] [compiler-rt] [libcxx] [libc] [clang-tools-extra] [flang] [libunwind] [libc++] Implement ranges::iota (PR #68494)

[Christopher Di Bella via cfe-commits]

https://github.com/cjdb requested changes to this pull request.

Thanks for working on this, it's an important algorithm to have. I've left some comments, but would like to see this merged by the end of January.

https://github.com/llvm/llvm-project/pull/68494