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

[Mircea Trofin via llvm-commits]

mtrofin wrote:

> > Anyway, I suspect it might be better to fix OutEdges in PGOUseBBInfo rather than using a different value in this one location.
> 
> If you want me to do that, you'll have to provide (unfortunately detailed) guidance, because I don't know how.

Looking.

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