[llvm] [BOLT][AArch64] Allow binary-analysis and heatmaptool to run with pac-ret binaries (PR #136664)

[Gergely Bálint via llvm-commits]

bgergely0 wrote:

With the new commit I do the check "later", e.g. not in `FillCFIInfo`, but only when BOLT would crash anyways. With this, I can make sure no unittests that passed before my change will fail.

https://github.com/llvm/llvm-project/pull/136664