Roll Dart to version ec86471ccc47a62df8b4009e1fb37c66ff9dc91b (#7363)

This roll includes the following changes

ec86471ccc Rephrase FormatException for int.parse
3d702164c9 Revert "bump to linter 0.1.77"
01a8ff067e Remove support for "@checked" annotations.
0e65e45e9e [vm/compiler] Do not use interface target for calls via getters
359217d30d Correct doc comment for sealed
fdee3a42e0 [vm, gc] Fix untracked pointer in DeoptContext.
af2e4d5855 add exception details to linter logging info
168dcbf7cc bump to linter 0.1.77
2111f507bd rework parsing local variable declaration with nullable type
0668014f30 [VM compiler] Take FutureOr into account when checking for Number type.
5334524f2b Remove conditional sync async code
42702e2c64 [vm] Spot fixes for Fuchsia
70d5438254 Redo "Extend allocator-initialization to some primitive types"
8170d27b99 Flag on target to indicate set literal support
ce256c762c Impl of INVALID_LITERAL_ANNOTATION
15b1c1c401 [vm] Return empty array for constant table rather than null when there are no libraries.
d200089583 Make MethodInvocationImpl.methodNameType a synonym of staticInvokeType if the target element is not a getter.
c32737cc4c Add open files to LSP server/drivers priorityFiles
5653dab2df Revise is/as parsing for nullable types
c442539619 Remove fasta parser listener.beginExpressionStatement
7e9c56c43b [Gardening] Kill any leaked flutter_tester processes before/after 3-head builder work
fd92515e14 Make ExprBuilder.uc private.
5d85f113e8 Add constant map-based set implementation.
0a0eac5038 [infra] Build Linux ARM architectures in tools/bots/dart_sdk.py.
5a29552002 Enable set literal tests for Fasta
7475080928 Enable set literals by default in the parser
60f6ccf3e4 Type inference of set literals
451fdc41e6 Experimental flags in Fasta
fa296dc3fa Add a string representation of initializer expressions to summaries.
38829df284 [VM/Compiler] Fix binds replaced with statements.
822ec43ab5 [dart:io] Fix WebSocket deflate compression of empty fragments.
ff10e5dd22 Class Hierarchy Builder
c565d4e477 Make the specification not mention `LinkedHashSet`.
9f866c8696 [Kernel] Do not serialize list lengths
31fa815dca Remove sealed ability on mixin
c37c7a2a77 [observatory] Include Contexts in user heap snapshots.
97156b5f41 [dart:io] Throw an exception if HttpClient attempts to connect after closing
08492f41cd [VM Runtime] Removed 'IsMoreSpecificThan' support in the VM.
78fdeb688f Improve the MUST_BE_IMMUTABLE messaging; Fixes #29394
0d744a51da Allow and enforce @immutable on mixins and mixin applications
16b51c3dc1 [vm/bytecode] Disable incremental compilation if bytecode is used
a9906d2cfb Revert "Extend allocator-initialization to some primitive types"
d8e920fbad [vm/bytecode] Correct token kind for _instanceOf calls
53447f5d63 Fix an exception in ErrorReporter that caused server to crash
5d3fb9f140 Extend allocator-initialization to some primitive types
d99fb0618f Remove unused imports
7eae70112c Handle InconsistentAnalysisException when attempting to generate completion suggestions (issue 35169)
0797d6ef69 Remove unused variables in analyzer workspace/
983795d26a Add Annotation support to LinterVisitor and NodeLintRegistry
428629efd8 Enforce sealed annotation on classes and mixins
e548154bbb [fuchsia] Update to new FIDL API
caf321aaa6 [fuchsia] Handle `host_{cpu,os}` vars in DEPS
66fa918fd3 [Kernel] Add text serializers for Let expressions
b84bfcce80 Remove some dead code from the analysis_server lsp support
73ea4b1a82 Remove dead code from the analysis_server tests
4b04ff2270 Remove dead code from analyzer_cli
01b23e23a4 [Kernel] Add text serializers for lists, sets, and maps
94e77946a0 [Kernel] Add text serializers for some DartTypes
64a4354a55 Improve handling of fatal errors in LSP
737209b85c Remove some unused hint codes
8c6f495f9b Stop creating contexts for excluded directories
28fb42cc5b [VM] Filter noSuchMethod forwarders from coverage reports
3a0da16796 Select to rely on ToBoolean conversion for null test
b61efcd3c4 [ VM / Service ] Started cleaning up tests for the service protocol.
f1002ce11b [ Gardening ] Marked co19_2/LibTest/isolate/Isolate/kill_A01_t01 as Timeout, Pass.

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': '88e6fe0f673e3d88f06fb6797103f9a9305961d9',
+  'dart_revision': 'ec86471ccc47a62df8b4009e1fb37c66ff9dc91b',
 
   # 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: c66bfe207912eaaeb3952f7cd95a1e7f
+Signature: 29cfd29c24487b4ee59633379ffa1809
 
 UNUSED LICENSES: