[release-branch.go1.17] runtime: mark TestGcSys as flaky

I don't know what this test is doing, but it very frequently flakes
for me while testing mundane compiler CLs. According to the issue log,
it's been flaky for ~3 years.

Updates #37331.
Fixes #52826.

Change-Id: I81c43ad646ee12d4c6561290a54e4bf637695bc6
Reviewed-on: https://go-review.googlesource.com/c/go/+/336349
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
(cherry picked from commit d8ceb133cac65b47c3f5bb292fbb28690c8b89a5)
Reviewed-on: https://go-review.googlesource.com/c/go/+/406974
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
1 file changed
tree: 3ddacf7e62e4038fca35e4771adac39136432193
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
  18. VERSION
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