Manual roll of Dart cb6ed67a73...7e8348f4ce (flutter#20135)

dart-lang/sdk@cb6ed67a73 [ VM ] Fix issue where dartdev's script_uri was being freed prematurely
dart-lang/sdk@da663d6eb0 [cfe] Fix bad supertype substitution in mixin check.
dart-lang/sdk@fad5548840 [cfe] Add test for issue for opt-in import of opt-out typedef
dart-lang/sdk@3d4bd859fb [cfe] Add test for type context in cascade
dart-lang/sdk@22dc855e46 [cfe] Implement toText for Binary/Unary/ParenthesizedExpression
dart-lang/sdk@1d092219a3 [cfe] Move LUB computation to package:kernel
dart-lang/sdk@33378492e5 [cfe] Implement new static types for arithmetic operations
dart-lang/sdk@7c7e931c14 Update reporting INCONSISTENT_LANGUAGE_VERSION_OVERRIDE on part directives.
dart-lang/sdk@c21128767e Use more shared asserts in UP/DOWN tests.
dart-lang/sdk@6a265278f9 [cfe] Fix off-by-one error in type variable target resolution
dart-lang/sdk@2195fe308b Don't create artificial PrefixedIdentifierImpl to check for ignored undefined.
dart-lang/sdk@8de8a1c226 Move codes from StaticTypeWarningCode into CompileTimeErrorCode.
dart-lang/sdk@2044eae133 [cfe] Add regression test for 40954
dart-lang/sdk@84d71cdf18 [cfe] Add regression test for 41108
dart-lang/sdk@19ee726cc1 [cfe] Add regression test for issue 42433
dart-lang/sdk@31d4511ad6 [vm/compiler] Fix handling of runtime offsets.
dart-lang/sdk@ddfc484e64 [co19] Roll co19 to 0fb063ff4707dbd7893f13d5babc30cdb80abd91
dart-lang/sdk@2484377465 [co19] Roll co19_2 to e48b3090826cf40b8037648f19d211e8eab1b4b6
dart-lang/sdk@01c217ecc9 Analyzer: Move tests for 5 codes to diagnostics/
dart-lang/sdk@1a829bbde0 Analyzer: Recategorize COULD_NOT_INFER as CompileTimeErrorCode
dart-lang/sdk@70aa3ac534 Update verify_diagnostics_test after moving to CompileTimeErrorCode.
dart-lang/sdk@ba92b78acd Move errors from StaticWarningCode to CompileTimeErrorCode.
dart-lang/sdk@0fcd35f653 Use Scope lookup directly in ReferenceResolver.
dart-lang/sdk@4de9f9f75a Sort error / hint codes.
dart-lang/sdk@8745cd5323 Use new Scope directly to simplify TypeNameResolver.
dart-lang/sdk@9e1b6030d2 Fix a type cast exception in the create-constructor fix (issue 42830)
dart-lang/sdk@bf411fcc10 Prepare to publish analyzer 0.39.15.
dart-lang/sdk@73748636ab [dart2js] Canonicalize empty collections in FunctionType
dart-lang/sdk@b4943094f0 [ VM / DartDev ] Spawn DartDev isolate with flags matching those used to generate the snapshot
dart-lang/sdk@8d8dbfcea2 Add @OverRide bulk-fix
dart-lang/sdk@6fc6c476b0 Updates for typed literals resolution tests.
dart-lang/sdk@f4053e3811 [dart2js] Use Maplet in deferred_Load
dart-lang/sdk@ac71a391a3 Add TypeSystemImpl.futureOrBase (), stop using iterable/mapForSetMapDisambiguation.
dart-lang/sdk@a4baaa3ac5 Fix a bug in the way RangeFactory deals with trailing commas in a list
dart-lang/sdk@b61e229a6d Issue 41065. Remove unnecessary null workaround.
dart-lang/sdk@9282f1b14a Fix for invalid implicit downcast in InterfaceType.allSupertypes.
dart-lang/sdk@4fcd77cbf3 [dart2js] Ensure setter Invocation names end with "=".
dart-lang/sdk@8c1829e110 bulk fix protocol wiring
dart-lang/sdk@f169b57293 [vm] Avoid eager creation of patch classes array in kernel loader
dart-lang/sdk@c65b444145 Analyzer: Move TOP_LEVEL_CYCLE to be a compile-time error
dart-lang/sdk@afee49e7c1 Add a default clientID when running in LSP mode
dart-lang/sdk@8c70a6004d Add tests for inconsistent language markers in part files.
dart-lang/sdk@37c8c709bf Move `BytesBuilder` class and implementation to `dart:typed_data`.

Author: a-siva

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': '7e8348f4ce87f89235154e974c799de57473c4f4',
+  'dart_revision': 'cb6ed67a7316e4173f3fd882c73c353d0533a3db',
 
   # 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: ab340e8a5209fd5df1280660cafa4ccd
+Signature: 7f5f1317ad0cdf579afba6e695998e8e
 
 UNUSED LICENSES:
 
@@ -9824,10 +9824,10 @@ FILE: ../../../third_party/dart/sdk/lib/core/null.dart
 FILE: ../../../third_party/dart/sdk/lib/core/stacktrace.dart
 FILE: ../../../third_party/dart/sdk/lib/core/string_sink.dart
 FILE: ../../../third_party/dart/sdk/lib/core/symbol.dart
+FILE: ../../../third_party/dart/sdk/lib/internal/bytes_builder.dart
 FILE: ../../../third_party/dart/sdk/lib/internal/list.dart
 FILE: ../../../third_party/dart/sdk/lib/internal/print.dart
 FILE: ../../../third_party/dart/sdk/lib/internal/symbol.dart
-FILE: ../../../third_party/dart/sdk/lib/io/bytes_builder.dart
 FILE: ../../../third_party/dart/sdk/lib/io/data_transformer.dart
 FILE: ../../../third_party/dart/sdk/lib/io/file.dart
 FILE: ../../../third_party/dart/sdk/lib/io/file_impl.dart