In kernel files assertion conditions are specified as a range of source
positions. Sometimes source texts are not available and VM cannot
extract assertion condition text, so Script::GetSnippet returns null.
With null safety it is no longer valid to pass null as a non-nullable
argument '_failedAssertion' of _AssertionError._create constructor,
so we should provide a valid String. This change converts 'null'
assertion condition text to "<optimized out>", similarly to AOT mode.
Issue https://github.com/flutter/flutter/issues/63513
Issue https://github.com/dart-lang/sdk/issues/34586
Change-Id: I9c5791e98fdef358068f3f5ddc4cfe98e8c7ed36
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/158162
Reviewed-by: Régis Crelier <regis@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Alexander Markov
274b4d3ecb