[llvm] Add `llvm.vector.partial.reduce.fadd` intrinsic (PR #159776)

[Sander de Smalen via llvm-commits]

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@@ -8114,6 +8114,19 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
                          Input, DAG.getConstant(1, sdl, Input.getValueType())));
     return;
   }
+  case Intrinsic::vector_partial_reduce_fadd: {
+    if (!TLI.shouldExpandPartialReductionIntrinsic(cast<IntrinsicInst>(&I))) {
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sdesmalen-arm wrote:

This can be removed after this TLI hook was removed in #161498

https://github.com/llvm/llvm-project/pull/159776