[llvm] [VPlan] Support live-ins without underlying IR in type analysis. (PR #80723)

[via llvm-commits]

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@@ -15,6 +15,7 @@ namespace llvm {
 
 class LLVMContext;
 class VPValue;
+class VPlan;
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ayalz wrote:

```suggestion
```
is this still needed?

https://github.com/llvm/llvm-project/pull/80723