[llvm] [AVR] Wrap out-of-bounds relative jumps (PR #118015)

[Fangrui Song via llvm-commits]

MaskRay wrote:

The PR introduced two tests, which each larger than 81KiB. There are many `call void asm sideeffect "nop", ""()`. You could replace then with a `.space` directive`. See other targets' tests named `branch-relaxation.ll`

https://github.com/llvm/llvm-project/pull/118015