[llvm] [Scalarizer][DirectX] support structs return types (PR #111569)

[Farzon Lotfi via llvm-commits]

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@@ -197,6 +197,23 @@ struct VectorLayout {
   uint64_t SplitSize = 0;
 };
 
+static bool isStructAllVectors(Type *Ty) {
+  if (!isa<StructType>(Ty))
+    return false;
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farzonl wrote:

I'd prefer not to do this change. If there was a property, I needed on StructType sure. But as it stands it just looks like creating a new variable for no reason.

https://github.com/llvm/llvm-project/pull/111569