[llvm] [LV] Bundle partial reductions inside VPExpressionRecipe (PR #147302)

[Sam Tebbs via llvm-commits]

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@@ -330,6 +331,8 @@ VPPartialReductionRecipe::computeCost(ElementCount VF,
   auto HandleWiden = [&](VPWidenRecipe *Widen) {
     if (match(Widen, m_Sub(m_ZeroInt(), m_VPValue(Op)))) {
       Widen = dyn_cast<VPWidenRecipe>(Op->getDefiningRecipe());
+      if (!Widen)
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SamTebbs33 wrote:

Yeah these changes came from #163175 but they belong in #162503 more. Removed.

https://github.com/llvm/llvm-project/pull/147302