Roll src/third_party/dart 11a3dd7332..600b2831ef (9 commits)

600b2831ef [dartdevc] Updating nullability inference to account for unevaluated constants
7c9d02b313 [vm/bytecode] Generate empty list literals more efficiently
bf293ea34c [vm/bytecode] Remove support for old version of bytecode format (v1)
e9f5b85492 [vm/bytecode] fixed typo in stack test
da15746f4c Update the production of training data
603a57e4c2 [vm, interpreter] Increment implicit accessor usage counts.
4d37977473 [vm/bytecode] Do not mark null-initialized instance fields as nullable too early
2f77af1c6f Fold `identical(double.nan, double.nan)` => `false` in dart2js.
f1cfcc621a [test/vm status files] Update vm status file to remove all entries related to spread and control_flow

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': '11a3dd7332f03c82fc01c19af3e75209ebb725a8',
+  'dart_revision': '600b2831ef76ad99fd4d11358a035956f5d8259d',
 
   # 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: 000c3eafbb894888c3cb2a57ebcf6ace
+Signature: 5c238ef9816dbc5ee5f25a2ceda8b238
 
 UNUSED LICENSES: