[clang] [clang][Driver][AVR] Reject c/c++ compilation for avr1 devices (PR #111798)

[David Spickett via cfe-commits]

DavidSpickett wrote:

Please add a release note in https://clang.llvm.org/docs/ReleaseNotes.html#avr-support (`clang/docs/ReleaseNotes.rst`).

Otherwise, this looks good to me.

https://github.com/llvm/llvm-project/pull/111798