[clang] Ofast deprecation clarifications (PR #101005)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> We could add similar clarifications to the release notes, which were initially included in an earlier version of this patch. So same question how we would need to approach that.

In terms of updating the release notes, once the cherry-pick happens, there's an automated bot message asking if you want to add a release note for the changes. I think the best way forward would be to follow those instructions and ask the release managers to help apply the changes.

https://github.com/llvm/llvm-project/pull/101005