Index: clang/lib/AST/ExprConstant.cpp
===================================================================
--- clang/lib/AST/ExprConstant.cpp
+++ clang/lib/AST/ExprConstant.cpp
@@ -11291,7 +11291,7 @@
   assert(!T->isDependentType() && "unexpected dependent type");
 
   QualType CanTy = T.getCanonicalType();
-  const BuiltinType *BT = dyn_cast<BuiltinType>(CanTy);
+  const BuiltinType *BT = cast<BuiltinType>(CanTy);
 
   switch (CanTy->getTypeClass()) {
 #define TYPE(ID, BASE)