several unit test failures in pkg_tested/dart_style/test/formatter_test when the analyzer is switched to --use-fasta-parser

[devoncarew]

./tools/test.py -m release -c none -r vm --checked --no-preview-dart-2 --use-sdk pkg_tested/dart_style/test/formatter_test

I see 4 unit test failures here, many with the message "Could not format because the source could not be parsed:".

[bwilkerson]

@danrubel in case the parser failures are interesting

[danrubel]

As of today, all but 3 are fixed. Working on them...

[danrubel]

dart formatter changes:

• ignore non-semantic errors from the parser
• update map literal test
• update covariant modifier test

[danrubel]

Blocked on dart-lang/dart_style#725

[devoncarew]

fixed I believe