[llvm] [NFCI][metadata][LibCallsShrinkWrap] Use create{Unlikely,Likely}BranchWeights (PR #89465)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic approved this pull request.

"2000" apparently originates from the comment at https://reviews.llvm.org/D24414#538699 .  If we've since adjusted builtin_expect, making this follow along seems fine.  LGTM

https://github.com/llvm/llvm-project/pull/89465