[llvm] [LV] Add initial support for vectorizing literal struct return values (PR #109833)

[Benjamin Maxwell via llvm-commits]

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@@ -566,7 +570,7 @@ FunctionType *VFABI::createFunctionType(const VFInfo &Info,
 
   auto *RetTy = ScalarFTy->getReturnType();
   if (!RetTy->isVoidTy())
-    RetTy = VectorType::get(RetTy, VF);
+    RetTy = ToWideTy(RetTy, VF);
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MacDue wrote:

Split off the VFABI changes (and some helpers) into #119000 :+1: 

https://github.com/llvm/llvm-project/pull/109833