Mark dwarf_stack_trace_test as flaky in product mode, due to identical code folding.

tests/standalone/standalone.status

 # Copyright (c) 2013, 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.
 
 # WARNING:
 # Tests using the multitest feature where failure is expected should *also* be
 # listed in tests/lib/analyzer/analyze_tests.status without the "standalone"
 # prefix.
 
 io/raw_socket_test: Pass, RuntimeError # Issue 28288
@@ skipping 340 matching lines @@
 [ $runtime == dart_precompiled || $compiler == app_jit ]
 package/scenarios/packages_file_strange_formatting/mixed_line_ends_test: Skip
 package/scenarios/packages_file_strange_formatting/empty_lines_test: Skip
 package/scenarios/invalid/invalid_utf8_test: Skip
 package/scenarios/invalid/same_package_twice_test: Skip
 package/scenarios/invalid/non_existent_packages_file_test: Skip
 package/scenarios/empty_packages_file/empty_packages_file_noimports_test: Skip
 package/scenarios/packages_option_only/packages_option_only_noimports_test: Skip
 package/scenarios/packages_option_only/packages_option_only_test: Skip
 
+[ $runtime == dart_precompiled && $mode == product ]
+dwarf_stack_trace_test: Pass, RuntimeError # Results will flake due to identical code folding
+
 [ $arch == simdbc || $arch == simdbc64 ]
 # SIMDBC interpreter doesn't support lazy linking of natives.
 link_natives_lazily_test: SkipByDesign
 
 # SIMDBC interpreter doesn't support --no_lazy_dispatchers
 no_lazy_dispatchers_test: SkipByDesign
 
 io/secure_unauthorized_test: Pass, RuntimeError # Issue 28719
 
 [ $system == android ]
@@ skipping 79 matching lines @@
 io/uri_platform_test: DartkCrash
 map_insert_remove_oom_test: Crash
 package/package1_test: CompileTimeError
 package/package_test: CompileTimeError
 package/scenarios/invalid/invalid_package_name_test: DartkCrash
 package/scenarios/invalid/invalid_utf8_test: DartkCrash
 package/scenarios/invalid/non_existent_packages_file_test: DartkCrash
 package/scenarios/invalid/same_package_twice_test: DartkCrash
 package/scenarios/packages_dir_only/packages_dir_only_test: CompileTimeError
 verbose_gc_to_bmu_test: RuntimeError