[llvm] [BOLT][AArch64] Make gs-pacret-autiasp.s deterministic (PR #145527)

[Paschalis Mpeis via llvm-commits]

paschalis-mpeis wrote:

Hey @kbeyls and @atrosinenko,

That was really helpful, thank you! 🙏 

 I've added the `g` symbol and updated each test case affected to make the test deterministic.

The root cause of the unresolved symbol [behaviour](https://github.com/llvm/llvm-project/pull/128576#issuecomment-2682489666) is still unclear. Perhaps BOLT treated that undefined call as non-external and assumes it cannot return/recover, causing the block to split?

We should keep this in mind and at some point investigate it further.

https://github.com/llvm/llvm-project/pull/145527