[llvm] [BOLT][AArch64] Fixes assertion errors occurred when perf2bolt was executed (PR #83394)

[Vladislav Khmelevsky via llvm-commits]

yota9 wrote:

Hi! I don't really mind to add stubs like this, although I would prefer asm test, since it is too deeply relies on the compiler code generation. Let also @rafaelauler tell his opinion on this :)

https://github.com/llvm/llvm-project/pull/83394