[llvm] [AVR] Fix for issue #163015, occasional corruption in stack passed params (PR #164001)

[Min-Yih Hsu via llvm-commits]

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mshockwave wrote:

`local_unnamed_addr` and `protected` are probably not needed. The `swiftself` below is probably redundant as well. Alternatively, you can use `llvm-reduce` to cleanup the test case: https://llvm.org/docs/CommandGuide/llvm-reduce.html

https://github.com/llvm/llvm-project/pull/164001