[Clang] Only non-overloaded dereference expressions are lvalues (#93457)

Fix a regression introduced by #88740

Fixes #92275

Author: cor3ntin

clang/lib/Sema/SemaOverload.cpp

@@ -14363,7 +14363,7 @@ Sema::CreateOverloadedUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc,
     if (Fn.isInvalid())
       return ExprError();
     return CXXOperatorCallExpr::Create(Context, Op, Fn.get(), ArgsArray,
-                                       Context.DependentTy, VK, OpLoc,
+                                       Context.DependentTy, VK_PRValue, OpLoc,
                                        CurFPFeatureOverrides());
   }
 

clang/test/SemaCXX/overloaded-operator.cpp

@@ -691,4 +691,15 @@ template <auto T> A<*T> operator *() { return {}; }
 // expected-error@-1 {{overloaded 'operator*' must have at least one parameter of class or enumeration type}}
 }
 
+namespace GH92275 {
+
+template <auto v>
+struct constant{};
+
+template <auto x>
+auto operator *(constant<x>)
+{ return constant<(*x)>{}; }
+
+}
+
 #endif