[llvm] [PGO] Fix branch weights overflow (PR #96541)

[Matthias Braun via llvm-commits]

MatzeB wrote:

This was already fixed in https://github.com/llvm/llvm-project/pull/90217 I believe and this change doesn't add anything on top of it, or am I missing something?

https://github.com/llvm/llvm-project/pull/96541