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

This reverts commit b15a0a37.

This should undo PR: https://github.com/llvm/llvm-project/pull/93314
will need to re-open https://github.com/llvm/llvm-project/issues/91421

wait for https://github.com/llvm/llvm-project/pull/90503 to land