[llvm] [BOLT] Check if symbol is in data area of function (PR #160143)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

> > Note that replacing `BL` with a `B` does not trigger it.
> 
> That's because there's no link to a data area without `BL`, as with BL we save the return address to the link register.

With `B` we will generate different code eliminating the branch and making `Symbol->getOffset()` return a different value resulting in a different code path.

https://github.com/llvm/llvm-project/pull/160143