Roll src/third_party/dart a9c77229c2..7fcaafbb3e (88 commits)

[bkonyi]

This is an automated pull request which will automatically merge once checks pass.

Roll src/third_party/dart a9c7722..7fcaafb (88 commits)

dart-lang/sdk@7fcaafbb3e [infra] Move IE registry settings from Puppet to the test runner
dart-lang/sdk@de11b7b373 [cfe] Implement legacy erasure
dart-lang/sdk@168cf90131 [vm] Make ELF loader Fuchsia compatible.
dart-lang/sdk@db525fe0f9 [kernel] Remove old unused 'method call' transformer
dart-lang/sdk@dd7499dd22 Revert "[infra] Try to handle failing to restore the crash resource limit instead."
dart-lang/sdk@ffd757640d Duplicate kernel package's graph.dart in analyzer, and prepare to publish 0.39.2+1.
dart-lang/sdk@eb862ca54d [dartdevc] Revert change to libraries.yaml to fix analyzer test bot
dart-lang/sdk@9f2be5cadf Move tests for 6 more diagnostic codes to the diagnostics/ directory
dart-lang/sdk@159c6da02a Add test for a @required field formal
dart-lang/sdk@bd8da4757e [vm/ffi] Remove simulator code
dart-lang/sdk@52dc7690ef Issue 39667. Use flow analysis in IfElement.
dart-lang/sdk@c17aff87e1 Restore skipping all dynamic type arguments in DartType.displayName
dart-lang/sdk@acac2d8d63 NNBD preview: Extract Dart page styles into their own file
dart-lang/sdk@c31db57c97 [dartfuzz] Add support for simple recursion
dart-lang/sdk@942c58f32d [dartdevc] Fix build errors in runtime patch files
dart-lang/sdk@98da22a11f [observatory] Display process-wide memory usage with heap snapshots.
dart-lang/sdk@f024d9dcce NullabilityEliminator - Never to Null*, remove required from formal parameters.
dart-lang/sdk@310c2eb5c4 Display target file name as link text
dart-lang/sdk@80aa5fda4b [observatory] Account for external size in the "Classes (table)" and "Classes (treemap)" views.
dart-lang/sdk@b92cd2cb95 Deprecate DartType.displayName, use getDisplayString() instead.
dart-lang/sdk@0939101320 When reporting unused elements, do not count a CommentReference as usage
dart-lang/sdk@70750329af [nnbd_migration] use animation/delay to make tooltips easier to use
dart-lang/sdk@afdc8caca8 [dartdevc] Finishing migration of dart:_interceptors and dart:_runtime.
dart-lang/sdk@84cc410c7e NNBD preview: move navigation; clean up styles
dart-lang/sdk@4c442cd73a [dart2js] Remove treatAsDynamic.
dart-lang/sdk@de53a2c33c [vm] Fix late local variables in AST mode
dart-lang/sdk@6267a8194e [ VM / dart:io ] Fix issue where SIGPROF is disabled in processes spawned via Process on POSIX
dart-lang/sdk@16bc1806ea (html) remove type parameter from callback argument
dart-lang/sdk@652926bbaf Deprecate Element.getAncestor, replacing it with methods matching those in AstNode
dart-lang/sdk@dfa32032fd Add scaffolding to trial_migration for more package sources.
dart-lang/sdk@d85eccb186 Prepare to publish analyzer 0.39.2.
dart-lang/sdk@a455e099bb Ignore _printEvent as an unused element
dart-lang/sdk@3281a4ab7f Move tests for 10 diagnostic codes to diagnostics/ files
dart-lang/sdk@4b21941d33 Fix prefer_iterable_wheretype in analyzer.
dart-lang/sdk@7bf088e4dd [release] Prepare the CHANGELOG for 2.7.0
dart-lang/sdk@54e1c16c1c Fix empty_catches in analyzer.
dart-lang/sdk@54b7543c55 Fix unnecessary_const in analyzer.
dart-lang/sdk@80a400297a [cfe] Add initial version of support for nonfunction-type-aliases
dart-lang/sdk@97c2ca5ff1 [cfe] Use valid static types and file offsets in collections transformation
dart-lang/sdk@daa400bada [sdk] Fix all uses of the view() constructor to always use offsetInBytes.
dart-lang/sdk@0dc6d59d52 [CFE] Fix crash caused by name clash of loadLibrary tearoff method
dart-lang/sdk@0bca6aaf10 Fix avoid_return_types_on_setters in analyzer.
dart-lang/sdk@e11cf75bd9 [dart2js] Propagate kernel variance to emit annotations in RTI table.
dart-lang/sdk@364dd8936b Fix unnecessary_new in analyzer.
dart-lang/sdk@723baf767f [analyzer] fix an npe in fix_internal.dart:2171
dart-lang/sdk@5adff879e3 Widen the SDK constraint on dart_internal to include 2.7.0.
dart-lang/sdk@eee20b4e60 Fix prefer_equal_for_default_values in analyzer.
dart-lang/sdk@f772b572c8 Fix curly_braces_in_flow_control_structures lint.
dart-lang/sdk@bf7f27a2c5 Remove comment about inlining constants.
dart-lang/sdk@b99599bae1 More cleanup of the loader code.
dart-lang/sdk@a3953b607d linter 0.1.105
dart-lang/sdk@41d8b9ee63 NNBD Migrator: Handle super redirecting initializers
dart-lang/sdk@baf1afa902 [dartdevc] Opt in dart:collection patch file for NNBD support
dart-lang/sdk@845fccc337 Issue 35818. Use getDisplayString() in _ElementWriter.
dart-lang/sdk@e20ff1e054 [vm] Prevent late fields from being unboxed
dart-lang/sdk@7ac3f3e904 NNBD migrator: Visit metadata on top-level functions
dart-lang/sdk@eba38af5d1 Add DartType.getDisplayString()
dart-lang/sdk@f7aff739bd Fix Isolate.packageRoot to account for the fact that it returns a Future.
dart-lang/sdk@1ff20f1e24 Rename "inv_cse_licm.dart" to "inv_cse_licm_test.dart".
dart-lang/sdk@7fcff7e87f Allow passing the sdk root for analysis to trial_migration.
dart-lang/sdk@929877c822 [gardening] Fix gen_kernel path on Windows for product_aot_kernel_test.dart.
dart-lang/sdk@bef857b6cb Fix dart:collection analysis errors in NNBD fork
dart-lang/sdk@88e26cd5d9 [dartdevc] Fix DDK sourcemap tests to use the right version of the SDK
dart-lang/sdk@1d4c45d2d0 Re-land "[vm/cfe] Elaborate for-in statements during async transform"
dart-lang/sdk@47a9ebea76 [cfe] Make API of as-instance-of and legacy LUB/GLB library-specific
dart-lang/sdk@ae14121ce7 [benchmark] Test addition of the whole d8 directory to builds.
dart-lang/sdk@e4e3f3fbc4 [cfe] Handle for-in on type variables in TypeEnvironment.forInElementType
dart-lang/sdk@c1565a7e64 [SDK] Cleans up a few unused functions in core_types.dart.
dart-lang/sdk@225682f868 [infra] Try to handle failing to restore the crash resource limit instead.
dart-lang/sdk@1a41670ed0 [infra] Temporarily disable exception for invalid core pattern
dart-lang/sdk@47383da053 Update LUB for Null vs star.
dart-lang/sdk@5ff9a2ed37 Cleanup the loader code to remove some unused pieces.
dart-lang/sdk@b8dbaaa527 [dartfuzz] Fix infinite recursion in call methods
dart-lang/sdk@6dc48ab999 [dartdevc] Destructure optional positional parameters
dart-lang/sdk@53bbe6c88c [dart2js] Added variance support for static subtype checking.
dart-lang/sdk@f56b0f6907 [vm/aot/tfa] Whole-program constant propagation
dart-lang/sdk@9929b53c71 [vm, gc] Allow old-space collections for allocations during safepoints.
dart-lang/sdk@a4bac1fb10 [dartdevc] Migrating dart:_js_helper and dart:_interceptors to NNBD.
dart-lang/sdk@2bb60763c3 Fix remove_type_annotation fix/assist to work with for loops (issue 39628)
dart-lang/sdk@c52acadd15 [vm/ffi] Split up some tests/ffi into vmspecific and non-vmspecific
dart-lang/sdk@1bbbc9f599 [vm/aot] Check in test to ensure in PRODUCT mode we don't retain any code in dart:vmservice_io/dart:_vmservice
dart-lang/sdk@eec49f34c4 Always truncate thread names on linux to 15 chars (16 with the null terminator).
dart-lang/sdk@28fc03709d NNBD preview: Improve details for overridden nullable parameter types
dart-lang/sdk@1c2ad7e2e1 [vm/aot] Remove assertion around committing object pool into GOP.
dart-lang/sdk@60afc24502 [infra] Convert some multi-tests to the new static error framework
dart-lang/sdk@b0155a72a7 [vm/ffi] Add script to extract existing positive ffi tests into bundle to be used for flutter/flutter integration test
dart-lang/sdk@f9327d3bac [SDK] Adds --lazy-async-stack support for async*.
dart-lang/sdk@42a4442521 [cfe] Handle promotion of Null to Never

[bkonyi]

Checks successful, automatically merging.