[llvm] [VPlan] Fix mutating whilst iterating over users in EVL transform (PR #122885)

[Florian Hahn via llvm-commits]

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@@ -1603,7 +1603,7 @@ static void transformRecipestoEVLRecipes(VPlan &Plan, VPValue &EVL) {
   LLVMContext &Ctx = CanonicalIVType->getContext();
   VPValue *AllOneMask = Plan.getOrAddLiveIn(ConstantInt::getTrue(Ctx));
 
-  for (VPUser *U : Plan.getVF().users()) {
+  for (VPUser *U : SmallVector<VPUser *>(Plan.getVF().users())) {
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fhahn wrote:

```suggestion
  for (VPUser *U : to_vector(Plan.getVF().users())) {
```

Should be possible to use `to_vector` I think

https://github.com/llvm/llvm-project/pull/122885