[llvm] [AVR] Add extra codegen test (PR #152902)

[Tom Vijlbrief via llvm-commits]

tomtor wrote:

@tgross35 

Thanks for the feedback, but the nightly build fails since 2025-08-07 till today:

searched nightlies: from nightly-2025-08-01 to nightly-2025-08-08
regressed nightly: nightly-2025-08-07
searched commit range: https://github.com/rust-lang/rust/compare/ec7c02612527d185c379900b613311bc1dcbf7dc...7
d82b83ed57d188ab3f2441a765a6419685a88a3
regressed commit: https://github.com/rust-lang/rust/commit/dc0bae1db725fbba8524f195f74f680995fd549e


https://github.com/llvm/llvm-project/pull/152902