Reland "Enable long path on Windows" This reverts commit f8fbefd951af2a21f5f85bb6d711b9d0bf636af2 in patchset 1 with fixes to the way how temporary strings are allocated and the way how prefixed string is returned in successive patchsets. Fixes https://github.com/dart-lang/sdk/issues/42416 Change-Id: Idb801cb117fc2d84fad4c533f5239d8499afc943 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/164741 Commit-Queue: Alexander Aprelev <aam@google.com> Reviewed-by: Siva Annamalai <asiva@google.com>
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