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

[Paschalis Mpeis via llvm-commits]

paschalis-mpeis wrote:

Now that #83394 is merged, I was able to rebase to main.

@yota9, can you please have a look now, sharing your thoughts on @samolisov concerns [here](https://github.com/llvm/llvm-project/pull/96626#discussion_r1659812304) as well?


Thanks in advance,
Paschalis

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