cmd/go: ignore coverpkg match on sync/atomic in atomic coverage mode

Otherwise we get into a dependency loop as we try to apply coverage
analysis to sync/atomic when the coverage analysis itself requires
sync/atomic.

Fixes #23694

Change-Id: I3a74ef3881ec5c6197ed348acc7f9e175417f6c7
Reviewed-on: https://go-review.googlesource.com/91875
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2 files changed
tree: 224370c708a90d7a43704e7a1c6c682c349fdbc7
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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