[llvm] [AVR] Fix a crash when generating debug information for frame pointer (PR #227285)

[Patryk Wychowaniec via llvm-commits]

https://github.com/Patryk27 requested changes to this pull request.

Neat!

With the changes in here, we should also update this comment:

https://github.com/llvm/llvm-project/blob/bfaa4cecfc7e0088e56c097259d77ec2f8b1f189/llvm/lib/Target/AVR/AVRISelLowering.cpp#L994

... and then we're ready to merge the changes.

https://github.com/llvm/llvm-project/pull/227285