[llvm] [BOLT] pacret-scanner: fix regression test failure (PR #128576)

[Kristof Beyls via llvm-commits]

kbeyls wrote:

> > ... which is caused by a seemingly recent change in BOLTs basic block calculation, where function calls seem to be ending basic blocks? I don't have a pointer to the commit that caused this change. I'll be looking for that later. For now, I'm trying to get the regression tests passing again.
> 
> There were no recent changes to the way we build BBs. Please keep us posted of your findings.

My git bisect run ended up pointing to commit 52fc6ffcda0895c0c7b976ad1f5cb5a282b571d2. I'd need to find some time to understand why this commit is causing the behavioural change in `llvm-bolt-binary-analysis`...

https://github.com/llvm/llvm-project/pull/128576