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

[Sander de Smalen via llvm-commits]

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@@ -13036,7 +13041,7 @@ SDValue DAGCombiner::foldPartialReduceMLAMulOp(SDNode *N) {
   }
 
   unsigned RHSOpcode = RHS->getOpcode();
-  if (!ISD::isExtOpcode(RHSOpcode))
+  if (!ISD::isExtOpcode(RHSOpcode) && RHSOpcode != ISD::FP_EXTEND)
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sdesmalen-arm wrote:

nit: maybe create a lambda to check the extend opcode.

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