Roll Dart to version eab492385c3f345cb2f44f3b702b0e30e4a9c107

[a-siva]

Includes the following changes:

eab4923 Updates for passing / failing analysis_server tests.
235ccc9 Remove --checked from dart --help
77d6758 Attempt to fix failing tests on the windows bots
a2b0529 [vm] Add timeline events for GC phases.
9e9adce [observatory] Include observatory main.dart.js.map with debug build.
7eda513 [infra] Add new vm-kernel-precomp builders to the test matrix
83aa463 Enable a few more server tests under CFE
75f92ac Point old super mixin informal spec to canonical copy
5dd2aca [kernel] Fix non-deterministic output generation
85d8524 [vm/kernel/bytecode] Revise access to instance fields in bytecode
af45552 [gen_snapshot] Remove --print_dependencies and --dependencies_only.
34f17b2 [VM] Add missing 6-type-test to subtypecache search in simdbc (it has it in 2 places)
19a90c2 More CFE tests for server
6879e4c Add completion contributor tests for CFE
6137511 Add more CFE tests for server
1cd9175 Fix mixed dartdoc processing
575a8f8 [VM] Extend subtype-test mechanism with support for generic methods
278d962 [vm/precomp] Update status files for Dart 1 AOT.
35d26c9 Always use relative paths to import from within the front end
84d8887 Fixes a minor typo in the documentation of the StreamTransformer class.
1b6992b [dart2js] Mark failing unit tests as RuntimeError to fix CQ (#34095)
9b5a424 [vm, gc] Don't rebuild the remembered set during marking.
c712470 dart2js status bingo
dac348c [observatory] Only run field guards test if it is enabled in the vm.
4d156f9 [dart2js] Fix function_type GVN bug
4196c0e Fix dart2js/sourcemaps/minified_names_test
8c059e7 Update language_2 status file for kernel bytecode passing tests.
ac69a30 [vm, gc] Rename store_buffer.h as pointer_block.h as it also defines the mark stack blocks.
9510738 dart2js status update
6bdf3b7 [observatory] Fix _guardLength serialization to output a string, rather than an int.
1f44496 Refactor dartdoc parsing
0fbe9d3 [dart2js] Dynamically generated tear-off constructors should have names
cb4f5b3 Resynthesize nameOffset for properties/parameters.
69f216d Fix mock SDK and Flutter to pass some Flutter tests.
c619413 Fix for unawaited future in assists.
66693ea [VM runtime] For now, do not use field guards when using kernel bytecode.
31765bf Clean up some hints in server code
c30af50 Store import prefix offset into metadata and resynthesize.
c439ebe [vm, gc] Update old allocation stats when scanning instead of pushing.
d933d4a Update tests for const constructors in subclasses of mixin applications
b570ea1 status update to make dart2js run function_type/ tests
9767af2 [vm/precomp] Support @pragma for fields and remove associated entry-point entries.
80e08e0 Use 'useCFE' flag to turn on CFE in AnalysisDriver.
98cf15c Remove unnecessary commentToken parameter
89fd468 remove unused DocumentationCommentToken.references field
49b1844 Refactor dartdoc parsing
bc8a838 Fix tests that reference the flutter package
de40820 [vm/precomp] Take 4 for procedure- and class-entrypoints.