[clang] [llvm] [clang] Reland Add tanf16 builtin and support for tan constrained intrinsic (PR #94559)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

PR https://github.com/llvm/llvm-project/pull/95518/files should address all backends.

Also SLPVectorizer was disabled for tan so I put out PR https://github.com/llvm/llvm-project/pull/95517

https://github.com/llvm/llvm-project/pull/94559