cmd/go: fix -covermode=atomic use of sync/atomic in -coverpkg matches
If we're using -covermode=atomic with -coverpkg, to add coverage to more than just the package being tested, then we need to make sure to make sync/atomic available to the compiler for every package being recompiled for coverage. Fixes #22728. Change-Id: I27f88f6a62e37d4a7455554cd03c8ca2b21f81a4 Reviewed-on: https://go-review.googlesource.com/81497 Run-TryBot: Russ Cox <rsc@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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