LibJS/Bytecode: Make for, do/while and while always switch to end block

Previously we only did this if the body block was not terminated.
If it was, all future codegen would happen in this block terminated
body block until another switch occurred, dropping all generated
instructions in this time on the floor.

Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp

@@ -738,10 +738,10 @@ Bytecode::CodeGenerationErrorOr<void> WhileStatement::generate_labelled_evaluati
         generator.emit<Bytecode::Op::Jump>().set_targets(
             Bytecode::Label { test_block },
             {});
-        generator.switch_to_basic_block(end_block);
-        generator.emit<Bytecode::Op::Load>(result_reg);
     }
 
+    generator.switch_to_basic_block(end_block);
+    generator.emit<Bytecode::Op::Load>(result_reg);
     return {};
 }
 
@@ -789,10 +789,10 @@ Bytecode::CodeGenerationErrorOr<void> DoWhileStatement::generate_labelled_evalua
         generator.emit<Bytecode::Op::Jump>().set_targets(
             Bytecode::Label { test_block },
             {});
-        generator.switch_to_basic_block(end_block);
-        generator.emit<Bytecode::Op::Load>(result_reg);
     }
 
+    generator.switch_to_basic_block(end_block);
+    generator.emit<Bytecode::Op::Load>(result_reg);
     return {};
 }
 
@@ -895,15 +895,15 @@ Bytecode::CodeGenerationErrorOr<void> ForStatement::generate_labelled_evaluation
         generator.emit<Bytecode::Op::Jump>().set_targets(
             Bytecode::Label { *test_block_ptr },
             {});
-
-        generator.switch_to_basic_block(end_block);
-        generator.emit<Bytecode::Op::Load>(result_reg);
     }
 
     if (has_lexical_environment)
         generator.end_variable_scope();
 
     generator.end_breakable_scope();
+
+    generator.switch_to_basic_block(end_block);
+    generator.emit<Bytecode::Op::Load>(result_reg);
     return {};
 }