[llvm] [AVR] Emit relocation record for local branch (PR #145291)

[Tom Vijlbrief via llvm-commits]

tomtor wrote:

> The failing tests are related to the emitting of a relocation label. So this is expected, and we should adapt these tests if we agree on this PR.

@benshi001 This was my comment before your comment. These failing tests are logical, because we generate different assembly now. Will study the tests, but these tests should be changed in the context of this PR.
However, it makes no sense to change them unless we decide that we are interested in fixing `-mrelax` for AVR.

https://github.com/llvm/llvm-project/pull/145291