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1. Add a Fatal assert when an OSError is reported with no error code (0). This is to ensure we get a coredum pwhen this happens so we can analyze it. (Please see https://github.com/flutter/flutter/issues/90921 for more details) TEST=ci Change-Id: I7146ac69ef8b1833f28bed8a23f0c27a2ece4bbf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/239726 Reviewed-by: Alexander Aprelev <aam@google.com> Commit-Queue: Siva Annamalai <asiva@google.com>