LibJS: Generate unwind chains for break in Bytecode

This uses a newly added instruction `ScheduleJump`
This instruction tells the finally proceeding it, that instead of
jumping to it's next block it should jump to the designated block.

Userland/Libraries/LibJS/Bytecode/Generator.h

@@ -213,7 +213,9 @@ public:
         }
     }
 
-    Label perform_needed_unwinds_for_labelled_break_and_return_target_block(DeprecatedFlyString const& break_label);
+    void generate_break();
+    void generate_break(DeprecatedFlyString const& break_label);
+
     Label perform_needed_unwinds_for_labelled_continue_and_return_target_block(DeprecatedFlyString const& continue_label);
 
     void start_boundary(BlockBoundaryType type) { m_boundaries.append(type); }