[llvm] [AVR][MC] Fix incorrect range of relative jumps (PR #109124)

[Patryk Wychowaniec via llvm-commits]

Patryk27 wrote:

@aykevl / @benshi001 could you create a backport to 19.1? (I think I can't assign milestones, so can't use the bot here)

https://github.com/llvm/llvm-project/pull/109124