[llvm] [SampleProfileLoader] Fix integer overflow in generateMDProfMetadata (PR #90217)

[Nabeel Omer via llvm-commits]

omern1 wrote:

> l see one failed test currently:
> 
>   | LLVM :: Transforms/SampleProfile/fnptr.ll
> 
> Is this unrelated?

My bad, now fixed.

https://github.com/llvm/llvm-project/pull/90217