Roll dart to a5e41681e55d1e74684bfff530218db556d77ee8 (flutter/engine#5467)

* Roll dart to a5e41681e55d1e74684bfff530218db556d77ee8.

* Update license

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': '1fe279d8598693e8005b71d6db386a96f2e49ce3',
+  'dart_revision': 'a5e41681e55d1e74684bfff530218db556d77ee8',
 
   'dart_args_tag': '1.4.1',
   'dart_async_tag': '2.0.7',

engine/src/flutter/lib/snapshot/libraries.json

@@ -11,7 +11,6 @@
           "../../../third_party/dart/runtime/lib/core_patch.dart",
           "../../../third_party/dart/runtime/lib/array.dart",
           "../../../third_party/dart/runtime/lib/array_patch.dart",
-          "../../../third_party/dart/runtime/lib/bigint.dart",
           "../../../third_party/dart/runtime/lib/bigint_patch.dart",
           "../../../third_party/dart/runtime/lib/bool_patch.dart",
           "../../../third_party/dart/runtime/lib/date_patch.dart",

engine/src/flutter/lib/snapshot/libraries.yaml

@@ -49,7 +49,6 @@ flutter:
         - "../../../third_party/dart/runtime/lib/core_patch.dart"
         - "../../../third_party/dart/runtime/lib/array.dart"
         - "../../../third_party/dart/runtime/lib/array_patch.dart"
-        - "../../../third_party/dart/runtime/lib/bigint.dart"
         - "../../../third_party/dart/runtime/lib/bigint_patch.dart"
         - "../../../third_party/dart/runtime/lib/bool_patch.dart"
         - "../../../third_party/dart/runtime/lib/date_patch.dart"

engine/src/flutter/runtime/dart_vm.cc

@@ -63,7 +63,6 @@ static const char* kDartLanguageArgs[] = {
     "--background_compilation",
     "--await_is_keyword",
     "--causal_async_stacks",
-    "--enable_kernel_expression_compilation=false", // TODO(dartbug.com/33087)
     // clang-format on
 };