[clang] [llvm] Revert "[clang] Add tanf16 builtin and support for tan constrained intrinsic (#93314)" (PR #93721)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

FYI @ilovepi @bogner to unblock other I am going to merge this reversion now without approvals.

https://github.com/llvm/llvm-project/pull/93721