cmd/go/internal/robustio: extend filesystem workarounds to darwin platforms
The macOS filesystem seems to have gotten significantly flakier as of
macOS 10.14, so this causes frequently flakes in the 10.14 builders.
We have no reason to believe that it will be fixed any time soon, so
rather than trying to detect the specific macOS version, we'll apply
the same workarounds that we use on Windows: classifying (and
retrying) the errors known to indicate flakiness and relaxing the
success criteria for renameio.TestConcurrentReadsAndWrites.
Fixes #33041
Change-Id: I74d8c15677951d7a0df0d4ebf6ea03e43eebddf9
Reviewed-on: https://go-review.googlesource.com/c/go/+/197517
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Jay Conrod <jayconrod@google.com>