Dart SDK roll for 2019-04-30

[bkonyi]

Roll src/third_party/dart c46deebfb6..5fbf7720f8 (68 commits)

5fbf7720f8 [ VM ] Updated splay-tree licenses, added V8 project authors to AUTHORS
e803d02227 [vm] Update Isolate to C++11 style.
aebc542801 update scanner to process language version comment
597e9c6222 Update new issue template.
af1dbdf13b Change representation of ExpressionChecks.
5152269d28 Convert another test class from ResolverTestCase to DriverResolutionTest
a8d034f3e1 [vm/reload] Make sure classes in saved class table are visited by GC
25daff618d Support for 'late' keyword.
ae97367e4a Support for 'required' keyword and default parameter kinds.
0213a31527 Fix for default parameters without name.
347b72c260 [vm] Bypass malloc for large Zone allocations to avoid jemalloc leaks.
a7325f9e59 Re-enable and fix the move_file_test.dart tests in the analysis server.
4215dc8365 cleanup analyzer warnings
f6f59c997f Rename quiver revision variable so it matches [dep_name]_tag pattern.
ea708965ab Find type alias self-references during linking.
afe805fa6e Fix hint unused_shown_name
156de21785 Adapt OptionalConstMixin to summary2.
0bfe57da52 Store unresolved URIs, but as empty strings.
ca3d908719 With issue 36262 fixed, remove the workaround.
4d7217016e encapsulate scanner configuration in ScannerConfiguration
7757c3e948 [vm] Consolidate generic move code between ParallelMoveResolver and FFICall
1dd0f88c84 Don't allow `null` as argument to `StreamIterator` constructor.
9cf5e51988 Consolidate test usage of ExpressionChecks.nullCheck into a single method.
43937aa9ca Don't let expression compilation bleed into real library
054d1a301c Another test for reissuing problems
0325d50db2 [CFE] Add disambiguation for type parameters if needed
d8739b582b Don't try to initialize from empty dill
af3ec66106 [Kernel] Fix specification of constant reference.
f3e1480b52 Update manifest checks watnings and corrections
243373af1c [vm, x64] Tighten the monomorphic entry sequence.
532226f024 The library is synthetic when its defining unit is synthetic.
6e72fed210 [vm] Fix for flaky crashes in background compiler while Dart_SortClasses() is running
611dbeb387 [vm, fuchsia] Fix deps and stop suppressing -fvisibility=hidden.
87a3256e8f Add lineOffset and columnOffset fields to the Script service protocol class.
0b9060ec1d [vm] Fixes for flaky crashes when querying source or source location
c944328528 Refactor types resolution, compute default types for type parameters.
6436104712 [vm/tests] Fix flaky crashes on vm/cc/GenKernelKernelMaxRSS test
b83902d51b Add a language_2 test for missing arguments related to required named parameters
950e174799 It is not an error for a late final variable to not have an initializer in nnbd
c4c357eb21 [vm/interpreter] Fix for flaky crashes in interpreter
6ef55cee3e [dart/vm] fix build breakage in assembler_dbc_test
9b3567a466 Rename poorly named error code and improve the message
7d462b12b9 [vm, fuchsia] Add back -fvisibility=hidden suppressions.
66fbaf30e6 Update CHANGELOG.md with AOT
9de07a2c58 [infra] Bump version file on master to 2.3.0
2f06696655 Include the keyword required when printing elements, with additional cleanup
49573f59d3 cleanup analyzer warnings
24396182e1 [ VM / Service ] Handle case where user navigates to Observatory without a slash trailing the authentication code.
4038f91c38 Change the messaging for the CrOS touchscreen check
e2d0f5a50b Add `featureSet` parameter to Parser constructor.
b378eef54a Add a option to pass in version file to tools
37f915543f Introduce AstFactory.compilationUnit2 with a required featureSet argument.
3d0825da5d Improve the message when a mixin cannot be applied because the superclass does not implement a required class (issue 36775)
3d0cdc8956 Switch perf.dart completely over to Fasta parser.
4028fec3b5 Reland "[vm] Finish adding support for ECMAScript 2018 features."
160aa37b9f Ignore exporting of unavailable libraries.
f598581e41 Support for type parameters in function typed formal parameters.
d816a46806 Convert MixinDriverResolutionTest to subclass DriverResolutionTest
fd76dda221 Identify mobile or web Flutter correctly when both are possible.
7e0d76c5dd Compute BuiltWorld properties from member usage
e00b2b577e [dart/fuzzer] restrict length parameter in List fill
5964ec4db7 Disable all tests in move_file_test.dart by renaming the file to move_file_disabled.dart
c3669f787e Add a diagnostic for missing arguments associated with required named parameters
f3b6028edc [vm/interpreter] Bump usage counters and trigger compilation of invoke-field
ec15148db2 [dart/fuzzer] no target on unsupported build targets
986978ad8e Additional FeatureSet plumbing for parser_fasta_test.dart
0dc33da6e8 Add LinterContext.canBeConstConstructor().
d03323783a Fix an exception in flutter outline when using ui-as-code elements (issue 36772)