[clang] [llvm] [x86] Add tan intrinsic part 4 (PR #90503)

[Thorsten Schütt via cfe-commits]

tschuett wrote:

Nit: the `declare` is not necessary anymore. You touched the IRTranslator without a test at, e.g., https://github.com/llvm/llvm-project/blob/main/llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll

https://github.com/llvm/llvm-project/pull/90503