LibJS: Allow yielding a class

Author: https://github.com/davidot
Commit: 4989e79c45
Pull-request: https://github.com/SerenityOS/serenity/pull/9085
Reviewed-by: https://github.com/IdanHo
Reviewed-by: https://github.com/linusg ✅
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibJS/Parser.cpp

@@ -1630,7 +1630,7 @@ NonnullRefPtr<YieldExpression> Parser::parse_yield_expression()
             yield_from = true;
         }
 
-        if (yield_from || match_expression())
+        if (yield_from || match_expression() || match(TokenType::Class))
             argument = parse_expression(0);
     }