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

[Vladislav Khmelevsky via llvm-commits]

https://github.com/yota9 approved this pull request.

Hi! Thanks for test changing. I'm approving this tmp patch since handling the functions with IndirectBranchType::UNKNOWN is still better than aborting on these cases.

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