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

[David Green via cfe-commits]

davemgreen wrote:

If you remove tan from isTriviallyVectorizable it should prevent vectorization in the short term.

It might be better to default FTAN to expand in https://github.com/llvm/llvm-project/blob/64c9a1e1266ec7bc4c4896b2df116fa12dbacf15/llvm/lib/CodeGen/TargetLoweringBase.cpp#L960, which seems to only be done for f32/f64/f128 at the moment.

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