[llvm-branch-commits] [IR] Remove ProfcheckDisableMetadataFixes checks (PR #222425)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/222425

Our internal ablation study on the set of checks up to 2-11-2026 has
finished, so we can remove any fixes that are older than that.

Also remove some calls to applyProfMetadataIfEnabled that were added
before the cutoff date. Leave the rest that were added afterwards.