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

[Avi Kivity via llvm-commits]

avikivity wrote:

@ellishg looks like we are stalled again. I don't believe it's possible to reduce the reproducer, as HEAD probably rejects the provided profile measurements, and 18.1.6 isn't able to emit llvm without applying some coroutine related passes first.

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