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

[James E T Smith via cfe-commits]

jamesETsmith wrote:

@philnik777, I think this is ready to go. Let me know if there's anything else you'd like me to change

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