[llvm] [IR][LangRef] Add partial reduction add intrinsic (PR #94499)

[Graham Hunter via llvm-commits]

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@@ -7914,6 +7914,28 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
     setValue(&I, Trunc);
     return;
   }
+  case Intrinsic::experimental_vector_partial_reduce_add: {
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huntergr-arm wrote:

I think we can pass this through as an INTRINSIC_WO_CHAIN node, at least for targets that support it.

https://github.com/llvm/llvm-project/pull/94499