Fix unevaluated rhs of class constant fetch in constant expression #11047
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Fixes oss-fuzz #57821
op1 and op2 should always be evaluated, even if the class constant fetch itself fails. Otherwise we can get unexpected constant ASTs at runtime (e.g.
Foo::class). This wasn't previously an issue because we don't allow(const_expr)::FOOin constant expressions, and op2 was always a string./cc @dstogov