[llvm] [IR] Add `llvm.sincos` intrinsic (PR #109825)

[Simon Pilgrim via llvm-commits]

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@@ -2899,6 +2943,18 @@ SDValue DAGTypeLegalizer::PromoteFloatRes_FFREXP(SDNode *N) {
   return Res;
 }
 
+SDValue DAGTypeLegalizer::PromoteFloatRes_FSINCOS(SDNode *N) {
+  EVT VT = N->getValueType(0);
+  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
+  SDValue Op = GetPromotedFloat(N->getOperand(0));
+  SDValue Res = DAG.getNode(N->getOpcode(), SDLoc(N), {NVT, NVT}, Op);
+
+  for (unsigned ResNum = 0; ResNum < N->getNumValues(); ResNum++)
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RKSimon wrote:

(style) `for (unsigned ResNum = 0, NumValues = N->getNumValues(); ResNum < NumValues; ++ResNum)`

https://github.com/llvm/llvm-project/pull/109825