LibJS: Generate bytecode for throw statements

Author: https://github.com/gunnarbeutner
Commit: b78f1c1261
Pull-request: https://github.com/SerenityOS/serenity/pull/7952
Reviewed-by: https://github.com/alimpfard

Userland/Libraries/LibJS/Bytecode/Op.h

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2021, Gunnar Beutner <gbeutner@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -395,6 +396,19 @@ public:
     String to_string(Bytecode::Executable const&) const;
 };
 
+class Throw final : public Instruction {
+public:
+    constexpr static bool IsTerminator = true;
+
+    Throw()
+        : Instruction(Type::Throw)
+    {
+    }
+
+    void execute(Bytecode::Interpreter&) const;
+    String to_string(Bytecode::Executable const&) const;
+};
+
 }
 
 namespace JS::Bytecode {