Some test files were included, where only their data actually
depended on line endings.

Some tests didn't actually depend on line ending at all.
(They may date back to a time where multiline strings didn't
normalize their newlines.)

Fix some syntax tests that had been formatted, and exempt
all files depending on line endings from formatting.

Change-Id: I6c003e9c4f03d3b2af102bfca59d4a7bc8e6d63f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/434380


Reviewed-by: Devon Carew <devoncarew@google.com>
Commit-Queue: Lasse Nielsen <lrn@google.com>