Roll src/third_party/dart 1bd6e20..1bc9fba (14 commits)

dart-lang/sdk@1bc9fba660 [cfe] Allow this access in late field initializers
dart-lang/sdk@696a374b6f Flow analysis: properly handle the fact that ++ and -- are assignments.
dart-lang/sdk@8f5a45c22d Flow analysis: add support for `??=`.
dart-lang/sdk@75bee2083a [samples/ffi] Add bitfield sample
dart-lang/sdk@8b1e73d15d Remove lazy FunctionTypeImpl.
dart-lang/sdk@b7911e4490 Flow analysis: add support for asserts.
dart-lang/sdk@abcd948982 Remove MultiplyInheritedMethodElementImpl, MultiplyInheritedPropertyAccessorElementImpl.
dart-lang/sdk@8107ba32b8 Remove FunctionElementImpl.shareParameters/shareTypeParameters.
dart-lang/sdk@faa56aa01d Remove LibraryResynthesizerContext.
dart-lang/sdk@c4b2be85ac Remove VariableElementImpl.declaredType
dart-lang/sdk@e4f7893545 [samples/ffi] Fix samples and run them as test - fix status file
dart-lang/sdk@17b5ddeeb8 [SDK] Adds tests for async stacktraces.
dart-lang/sdk@0f2787c9f3 validation of @nonvirtual use
dart-lang/sdk@4d1bc04d69 [cfe] Flatten TypeInferrer(Engine) hierarchies

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': '1bd6e20d769bf7d75a2dc8768bfbe4a2e2948977',
+  'dart_revision': '1bc9fba6605a97d4bbd70045aed4a4b1a8c8f095',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: 77ba8904412d3918c5f2f1de2ab0102c
+Signature: 17aff6202de730f1f648b4ec5c26666f
 
 UNUSED LICENSES:
 
@@ -7665,6 +7665,7 @@ FILE: ../../../third_party/dart/runtime/vm/type_testing_stubs_arm64.cc
 FILE: ../../../third_party/dart/runtime/vm/type_testing_stubs_x64.cc
 FILE: ../../../third_party/dart/samples/ffi/coordinate.dart
 FILE: ../../../third_party/dart/samples/ffi/dylib_utils.dart
+FILE: ../../../third_party/dart/samples/ffi/sample_ffi_bitfield.dart
 FILE: ../../../third_party/dart/samples/ffi/sample_ffi_data.dart
 FILE: ../../../third_party/dart/samples/ffi/sample_ffi_dynamic_library.dart
 FILE: ../../../third_party/dart/samples/ffi/sample_ffi_functions.dart