Roll src/third_party/dart e94e797d7b..9450c6d829 (8 commits)

9450c6d829 Move SUBTYPE_OF_SEALED_CLASS to own file, and DriverResolutionTest
603678e46c [vm, gc] Streamline the promotion allocation fast path.
8fd09304b6 [vm, gc] Force inline MarkObject into its sole caller.
fb88c983e7 [vm/compiler] Switch kernel helper for background compiler to use new space.
6d575152c9 [vm/compiler] Changes in Cid range computation
2d58ea3b42 [dartdevc] fix flutter#35554, throw NullThrownError when null is thrown
25aa35ef98 Convert ast.dart to triple-slash comment style
b11cb39d66 [DDC] Support implict casts in [ForLoopStatement2]

Author: bkonyi

DEPS

@@ -31,7 +31,7 @@ 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': 'e94e797d7b65bae5e036161c6ad62a7894a07a82',
+  'dart_revision': '9450c6d829a91b055982eec3eb4d7f83d8686a11',
 
   # 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: 54c7a95ddf78efb1fdfafc5db3ba46fa
+Signature: efafbbb1222897f979c2a4a6115ad024
 
 UNUSED LICENSES: