[llvm-branch-commits] [IR] Remove ProfileCount Abstraction (PR #204770)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/204770

This only exists to differentiate between real and synthetic profiles.
Remove the abstraction now that we plan to fully remove synthetic
profiles.