[clang] [clang-tools-extra] [clang] AST: fix getAs canonicalization of leaf types (PR #155028)

[Andrey Ali Khan Bolshakov via cfe-commits]

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@@ -878,10 +878,10 @@ static bool 
IsStructurallyEquivalent(StructuralEquivalenceContext &Context,
       // Treat the enumeration as its underlying type and use the builtin type
       // class comparison.
       if (T1->getTypeClass() == Type::Enum) {
-        T1 = T1->getAs<EnumType>()->getOriginalDecl()->getIntegerType();
+        T1 = dyn_cast<EnumType>(T1)->getOriginalDecl()->getIntegerType();
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bolshakov-a wrote:

Seemingly, could be just `cast`?

https://github.com/llvm/llvm-project/pull/155028
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