[llvm] [BOLT][AArch64] Implemented createDummyReturnFunction. (PR #96626)

[Amir Ayupov via llvm-commits]

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

Thanks for working on this. Left a comment inline. Please also retitle as an imperative statement: "[BOLT][AArch64] Implement createDummyReturnFunction".

https://github.com/llvm/llvm-project/pull/96626