Roll src/third_party/dart d9489622be..a554c8be6b (10 commits)

dart-lang/sdk@a554c8be6b Fix language_2/flatten_test.
dart-lang/sdk@95d7749f48 [vm/compiler] OSR on non-empty stack integrity
dart-lang/sdk@683dca0e9a [vm/fuzzer] Fix an inconsistency with local names
dart-lang/sdk@7516af7237 Add support for test requirements.
dart-lang/sdk@1cd6518897 Revert "[vm/bytecode] Workaround for incorrect type parameters in function types"
dart-lang/sdk@d7dc524b5f [vm, bytecode] Use call-scoped temporaries for NativeArguments to reduce the frame size of Interpreter::Call.
dart-lang/sdk@9f778d69f4 Fix language_2/external_test.
dart-lang/sdk@a09845fe3d [vm/fuzzer] Track and print invalid test cases
dart-lang/sdk@c138b505be Update TypeSystem tests to reuse AbstractTypeSystemTest.
dart-lang/sdk@c858519064 Delete lib_2/async/timer_not_available_test.

DEPS

@@ -34,7 +34,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'd9489622befb638c040975163cf9b8eba2ff057b',
+  'dart_revision': 'a554c8be6ba94cc2c7312dbde5eb85537a35f607',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

-Signature: c1159f65a108cc6fff4fa6ad8ea69b83
+Signature: 7e7be36362074f2cd4641156a163704f
 
 UNUSED LICENSES: