7a177114df
Use the "spinbit" mutex implementation always (including on platforms that need to emulate atomic.Xchg8), and delete the prior "tristate" implementations. The exception is GOARCH=wasm, where the Go runtime does not use multiple threads. For #68578 Change-Id: Ifc29bbfa05071d776c23a19ae185891a03a82417 Reviewed-on: https://go-review.googlesource.com/c/go/+/658456 Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com> Reviewed-by: Junyang Shao <shaojunyang@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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