[llvm] [SLP] Initial vectorization of non-power-of-2 ops. (PR #77790)

[Alexey Bataev via llvm-commits]

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@@ -4771,6 +4789,9 @@ void BoUpSLP::reorderBottomToTop(bool IgnoreReorder) {
         auto Res = OrdersUses.insert(std::make_pair(OrdersType(), 0));
         const auto &&AllowsReordering = [IgnoreReorder, &GathersToOrders](
                                             const TreeEntry *TE) {
+          // Reordering for nodes with padding not implemented yet.
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alexey-bataev wrote:

```suggestion
          // FIXME: Reordering for nodes with padding not implemented yet.
```

https://github.com/llvm/llvm-project/pull/77790