LibJS/JIT: Compile the BlockDeclarationInstantiation instruction

Author: https://github.com/skyrising
Commit: 09dce5f1bd
Pull-request: https://github.com/SerenityOS/serenity/pull/21677

Userland/Libraries/LibJS/JIT/Compiler.h

@@ -103,7 +103,8 @@ private:
         O(TypeofVariable, typeof_variable)                                       \
         O(SetVariable, set_variable)                                             \
         O(ContinuePendingUnwind, continue_pending_unwind)                        \
-        O(ConcatString, concat_string)
+        O(ConcatString, concat_string)                                           \
+        O(BlockDeclarationInstantiation, block_declaration_instantiation)
 
 #    define DECLARE_COMPILE_OP(OpTitleCase, op_snake_case) \
         void compile_##op_snake_case(Bytecode::Op::OpTitleCase const&);