[llvm] [memprof] Migrate away from PointerUnion::dyn_cast (NFC) (PR #123716)

[Nikita Popov via llvm-commits]

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@@ -3560,7 +3560,7 @@ ModuleCallsiteContextGraph::getAllocationCallType(const CallInfo &Call) const {
 
 AllocationType
 IndexCallsiteContextGraph::getAllocationCallType(const CallInfo &Call) const {
-  const auto *AI = Call.call().dyn_cast<AllocInfo *>();
+  const auto *AI = dyn_cast<AllocInfo *>(Call.call());
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nikic wrote:

```suggestion
  const auto *AI = cast<AllocInfo *>(Call.call());
```

https://github.com/llvm/llvm-project/pull/123716