[llvm] [SelectionDAG] Add PARTIAL_REDUCE_U/SMLA ISD Nodes (PR #125207)

[Sander de Smalen via llvm-commits]

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@@ -2473,6 +2473,23 @@ SDValue SelectionDAG::getShiftAmountOperand(EVT LHSTy, SDValue Op) {
   return getZExtOrTrunc(Op, SDLoc(Op), ShTy);
 }
 
+SDValue SelectionDAG::expandPartialReduceMLA(SDNode *N) {
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sdesmalen-arm wrote:

Could you move to TargetLoweringInfo instead? That seems to be where most of the other expand code lives.

https://github.com/llvm/llvm-project/pull/125207