[llvm] [clang] [clang-tools-extra] [PGO] Add ability to mark cold functions as optsize/minsize/optnone (PR #69030)

[Arthur Eubanks via cfe-commits]

aeubanks wrote:

I don't understand, if you're saying the profile is accurate, then those functions are actually cold, so we should be able to mark them as optsize?

https://github.com/llvm/llvm-project/pull/69030