* Add "usingFastaParser" accessor for Analyzer engine tests
* Update Analyzer compile time error code tests
* Add additional checks for async/await/yield as identifiers
* Update built-in as type variable error message
* Check for "this." in local declaration parameters
* Remove unnecessary asserts
and address comment in https://dart-review.googlesource.com/c/sdk/+/57022
Change-Id: I54b5ac22f912289dad6360646fae7eca717bbd98
Reviewed-on: https://dart-review.googlesource.com/57220
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>
a53b585498