f59c521959
Fixes https://github.com/dart-lang/sdk/issues/52309 TEST=run tests\co19\src\LibTest\io\exit\exit_A01_t01.dart for example with UNC path to dart.exe Change-Id: Ief6eb4cda24422a9a100abaf5173bb95e44d19bf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/302060 Reviewed-by: Siva Annamalai <asiva@google.com> Commit-Queue: Alexander Aprelev <aam@google.com>