[clang] [llvm] [AVR] Add many new AVR MCU model definitions (PR #144229)

[Ben Shi via llvm-commits]

benshi001 wrote:

> manage to run these tests locally yet, but will figure that out.

This flang failure did not relate to your AVR patch, just omit it.

https://github.com/llvm/llvm-project/pull/144229