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[clang] Reland Add tanf16 builtin and support for tan constrained int…
…rinsic (llvm#94559) Relanding this PR now that llvm#90503 has merged. with `FTAN` landing in [TargetLoweringBase.cpp:L1021](https://github.com/llvm/llvm-project/blob/main/llvm/lib/CodeGen/TargetLoweringBase.cpp#L1020C23-L1021C63 ) There is now a llvm tan intrinsic 32\64\128 Expand case for all llvm backends. In LLVM, the `llvm.experimental.constrained.cos` and `llvm.experimental.constrained.sin` intrinsics are used for performing cosine and sine calculations with additional constraints on floating-point operations. This behavior is expected for all floating-point math intrinsics. This change adds these constraints for the `tan` intrinsic. - `Builtins.td` - replace TanF128 with F16F128MathTemplate - `CGBuiltin.cpp` - map existing tan builtins to `tan` and `constrained_tan` intrinsic - `ConstrainedOps.def` map tan and constrained_tan to an ISDOpcode. resolves llvm#91421 --------- Co-authored-by: Farzon Lotfi <farzon@farzon.com>
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