Roll src/third_party/dart b6997deb3e..1577b95c93 (18 commits)

1577b95c93 [CFE] Substitute types in unevaluated as-expressions and instantiations
8c2390089e [co19] DEPS updated
dd19353abb Update test of operator >>>.
dcc157633d Offset from class when reporting errors on synthetic constructors
54f9835abf The function type might be null in GenericTypeAlias.
1682b4aac5 replace parser language version comment processing
aceefaf846 [dart/vm]: fix bug in TextBuffer capacity
1ea3e418b5 Bump oldest supported ABI version
143ebf1c1c Compute default types for type parameters of GenericTypeAlias.
2209d8f0c0 Run VariableResolverVisitor during resolution.
a7c0a75442 Disable DeclarationResolver tests with summary2.
f7b73e9c4b Read linked bundles from ByteStore.
2279d88f1f Pass CompilationUnitElement to LocalElementBuilder when building locals.
a62ab22c48 remove languageVersionField and update scanner tests
52608e3174 Convert more tests to DriverResolutionTest
73639f9e1f pkg/modular_test: follow up cleanup
49dfd6f4df Build elements for constructor initializers.
f66ef921ac Write and read comment references.

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': 'b6997deb3ea030145555195a295e599cf8099f40',
+  'dart_revision': '1577b95c93823339150736e8c54f4524da4339be',
 
   # 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: 3a6811f2d6af8b0c5cb5d3d2ef362d56
+Signature: dd5689b8b3c0b10121f7f36296f967fd
 
 UNUSED LICENSES: