Roll Dart SDK from f997d62a6d29 to 20bf2fcf5670 (18 revisions)

[skia-flutter-autoroll]

https://dart.googlesource.com/sdk.git/+log/f997d62a6d29..20bf2fcf5670

2020-07-14 [email protected] [vm/compiler] Make precompiler prune invocation dispatchers the same way we do for regular/closure functions
2020-07-14 [email protected] [build] Change flutter-engine patch for async to use updated Dart SDK hash
2020-07-14 [email protected] Roll benchmarks-internal 78e4b5975ab4..9bfe209a53a5
2020-07-14 [email protected] [vm] Remove unused function
2020-07-14 [email protected] update async in the sdk, add flutter engine patch
2020-07-14 [email protected] analyzer: Move tests for 9 codes to diagnostics/
2020-07-14 [email protected] Prepare to publish analyzer 0.39.13
2020-07-14 [email protected] [VM/nnbd] Class Future may be used for type normalization before it is cached in the object store.
2020-07-14 [email protected] [ package:dds ] Fixed expression evaluator expecting a double-nested 'result' from an external 'compileExpression' implementation
2020-07-14 [email protected] [ddc] Copy more .dill files to packaged sdk
2020-07-13 [email protected] Update to latest package:matcher
2020-07-13 [email protected] [vm/bytecode] Ensure class is allocate-finalized before instantiated by bytecode runtime calls.
2020-07-13 [email protected] Remove dart:io dep from utils.dart and add conditional imports for File
2020-07-13 [email protected] [ package:dds ] Fix issue where StateError could be raised when a client disconnects from DDS after the VM service has shutdown
2020-07-13 [email protected] [ddc] Inline the sound null safety flag
2020-07-13 [email protected] Support for data attachments to OperationPerformance.
2020-07-13 [email protected] Instrument getAnalysisOptions() for Cider.
2020-07-13 [email protected] Remove deprecated CiderOperationPerformance.

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[a-siva]

Landing this CL as the flutter engine bot is turning green