Roll Dart SDK from 87900c1affc8 to a81fbf00dde7 (1 revision) (#28365)

DEPS

@@ -39,7 +39,7 @@ 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': '87900c1affc8d8c47c17900635028b44e06661a6',
+  'dart_revision': 'a81fbf00dde7827a8d806e64be9f1213fcff7efd',
 
   # 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: a993aa03090b864a7f5c3304cbe5e4a9
+Signature: c96c4cba473b1737ae46df2ad6afa687
 
 UNUSED LICENSES:
 
@@ -9799,10 +9799,6 @@ FILE: ../../../third_party/dart/runtime/vm/compiler/backend/typed_data_aot_test.
 FILE: ../../../third_party/dart/runtime/vm/compiler/backend/yield_position_test.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/graph_intrinsifier.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/graph_intrinsifier.h
-FILE: ../../../third_party/dart/runtime/vm/compiler/graph_intrinsifier_arm.cc
-FILE: ../../../third_party/dart/runtime/vm/compiler/graph_intrinsifier_arm64.cc
-FILE: ../../../third_party/dart/runtime/vm/compiler/graph_intrinsifier_ia32.cc
-FILE: ../../../third_party/dart/runtime/vm/compiler/graph_intrinsifier_x64.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/offsets_extractor.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/recognized_methods_list.h
 FILE: ../../../third_party/dart/runtime/vm/compiler/relocation.cc