[llvm] [Instrumentation] Fix EdgeCounts vector size in SetBranchWeights (PR #99064)

[Avi Kivity via llvm-commits]

avikivity wrote:

> > @mtrofin a week has passed, can we perhaps enlist a different reviewer?
> 
> Let's merge it at this point. Do you have commit rights?

I do not. I'm not an LLVM developer, just a random person on the internet.

https://github.com/llvm/llvm-project/pull/99064