Make rewind work on DBC

runtime/observatory/tests/service/service.status

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Flaky failures
 get_allocation_samples_test: Pass, RuntimeError # Inconsistent stack trace
 reload_sources_test: Pass, Slow # Reload is slow on the bots
 get_retained_size_rpc_test: Pass, RuntimeError # Issue 28193
 pause_on_start_and_exit_test: Pass, RuntimeError # Issue 28624
 pause_on_start_then_step_test: Pass, RuntimeError # Issue 28624
@@ skipping 63 matching lines @@
 next_through_create_list_and_map_test: RuntimeError
 next_through_closure_test: RuntimeError
 
 [ $compiler == dart2analyzer ]
 evaluate_activation_in_method_class_test: CompileTimeError # Issue 24478
 
 [ $arch == simdbc || $arch == simdbc64 ]
 get_allocation_samples_test: RuntimeError # Profiling unimplemented.
 get_cpu_profile_timeline_rpc_test: RuntimeError # Profiling unimplemented.
 implicit_getter_setter_test: RuntimeError # Field guards unimplemented.
-rewind_test: RuntimeError # Issue 27878
-rewind_optimized_out_test: RuntimeError # Issue 27878
 
 # Debugging StringConcatenation doesn't work the same on simdbc as on other platforms.
 next_through_catch_test: RuntimeError
 next_through_simple_async_test: RuntimeError
 next_through_simple_linear_2_test: RuntimeError
 
 [ $hot_reload || $hot_reload_rollback ]
 # Skip all service tests because random reloads interfere.
 *: SkipByDesign # The service tests should run without being reloaded.
 
 [ $system == windows ]
 dev_fs_weird_char_test: Skip # Windows disallows question mark in paths
 dev_fs_http_put_weird_char_test: Skip # Windows disallows carriage returns in paths
 complex_reload_test: Skip # Issue 27861
 
 # Service protocol is not supported in product mode.
 [ $mode == product ]
 *: SkipByDesign