Roll src/third_party/dart bd049f5b53...622ec5099f (#10437)

dart-lang/sdk@622ec5099f Support tearoffs through extension overrides
dart-lang/sdk@42e978ca54 Fix Windows bot.
dart-lang/sdk@86bdb3e3fa Clean up some warnings in analysis server code
dart-lang/sdk@972d4e9a75 [cfe] Move relativize code from dart2js to cfe
dart-lang/sdk@db3028ac5e [dart2js] Enable --benchmarking-x
dart-lang/sdk@7826b4faf1 Partially support extensions of function types
dart-lang/sdk@b66cd42372 [vm] Fix deadlock in isolate shutdown, take 2.
dart-lang/sdk@6cec64691b [dartdevc] Remove variance from type bounds in generic function subtypes
dart-lang/sdk@a05ef7c0cc Store inferred type arguments for tear-off(s).
dart-lang/sdk@5456641022 More canonicalization_hashing tests
dart-lang/sdk@dbabe4dea6 [dartdevc] Imports/Exports are now aliased relative to the library root to disambiguate cross-module name conflicts.
dart-lang/sdk@ebc4a59b61 Use Dart_PrepareToAbort in segfault handlers for consistency.
dart-lang/sdk@136aee0655 [analysis_server] Fix flaky hanging in analysis server benchmark
dart-lang/sdk@677f434a6b Fix computeUnlinkedApiSignature() to change signature when body changed from/to empty.
dart-lang/sdk@7582d344d6 Migration: handle assignment of null to generic type.
dart-lang/sdk@150e8f89d5 [dart/vm] Fix dominance violation
dart-lang/sdk@08553214ad [dartdevc] Fix optional and named params being detected as not nullable
dart-lang/sdk@bbc97f5f79 Improve some diagnostic messages
dart-lang/sdk@0ea0409401 [vm/ios] Don't use __clear_cache on iOS, it's not always available.
dart-lang/sdk@7825801189 [cfe] Refactor [ValueKind] to support unions of types.
dart-lang/sdk@68e4eeee12 [cfe] Handle property access, update and method invocation on explicit/implicit this in extension methods
dart-lang/sdk@91dadded66 [vm/compiler] Recognize _asyncStackTraceHelper and build special graph if !FLAG_causal_async_stacks
dart-lang/sdk@a69c81ac34 Id testing for directories with .packages etc
dart-lang/sdk@d49de8b68f succinct option for id testing
dart-lang/sdk@60f646a51c [CFE] Do not accept null expressions in constant evaluator.
dart-lang/sdk@d89fd68871 [infra] Update pub/sub script to send <10MB when message is base64 encoded.
dart-lang/sdk@86acffa440 fix prefixed type recovery crash
dart-lang/sdk@6123dbdae5 Support for extensions in available declarations.
dart-lang/sdk@99d7701004 [gardening] Skip timing out co19_2/LibTest/isolate tests on dartkb bots
dart-lang/sdk@c4e423db48 Deprecate isSupertypeOf, flattenFutures, isAssignableTo of DartType.
dart-lang/sdk@6a4d805df4 Implement 'Import Library' quick fix using DeclarationsTracker.
dart-lang/sdk@2d381e5ac1 Extract AstRewriteVisitor into separate library.
dart-lang/sdk@52ce6273f3 [dart/vm] Rerun test on return code divergence
dart-lang/sdk@c07bd65ac8 Convert driver.dart to triple-slash comment style.
dart-lang/sdk@7ffef4c616 [llvm] Make sure llvm groups don't break the build
dart-lang/sdk@521a106332 [infra] Update VS toolchain to stay up-to-date with flutter engine and chrome
dart-lang/sdk@130c654dcd [vm/compiler] Avoid runtime call for _asyncStackTraceHelper if !FLAG_causal_async_stacks
dart-lang/sdk@1e16b74b5b Update cipd dependency dart/language_model to latest version to use copy instead of symlink
dart-lang/sdk@0639908ecc Resolve call method when defined by an extension

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': 'bd049f5b53ef0730fa6cbd7b88656f1bec308283',
+  'dart_revision': '622ec5099fb71a12b65a16e98422458f2d490d5c',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -192,7 +192,7 @@ deps = {
   # WARNING: Unused Dart dependencies in the list below till "WARNING:" marker are removed automatically - see create_updated_flutter_deps.py.
 
   'src/third_party/dart/pkg/analysis_server/language_model':
-   {'packages': [{'version': 'gABkW8D_-f45it57vQ_ZTKFwev16RcCjvrdTCytEnQgC', 'package': 'dart/language_model'}], 'dep_type': 'cipd'},
+   {'packages': [{'version': 'CLFJXCl5lq8YMcrqbN8xF38jhhn0oznsKjBHaE5DyTgC', 'package': 'dart/language_model'}], 'dep_type': 'cipd'},
 
   'src/third_party/dart/third_party/observatory_pub_packages':
    Var('dart_git') + '/observatory_pub_packages.git' + '@' + Var('dart_observatory_pub_packages_rev'),

ci/licenses_golden/licenses_third_party

-Signature: 8b741da9209824b378c43bf94209e9b3
+Signature: 7d28bc9f2770eec75d585e267d95a4ba
 
 UNUSED LICENSES: