[clang] [llvm] [clang] Add tanf16 builtin and support for tan constrained intrinsic (PR #93314)

[Damyan Pepper via llvm-commits]

https://github.com/damyanp approved this pull request.

IMO it'd be good to have a bit more context in the commit description about why this is being done. If you follow the breadcrumbs from the issue to the thread in the PR I think you can put it together, but a more local summary might be helpful.

https://github.com/llvm/llvm-project/pull/93314