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

[Matthias Braun via llvm-commits]

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

LGTM

FWIW: I also think that having two code paths for prof/non-profi is not great, but that shouldn't block a simple bug fix.

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