Go 1.24 included the spinbitmutex GOEXPERIMENT for several popular
architectures, based on their native support an atomic primitive (8-bit
exchange) that aided its efficient implementation.
Move towards making the new mutex implementation permanent, so it fully
replaces the two previous (sema- and futex-based "tristate")
implementations.
For #68578
Change-Id: I888a73959df42eb0ec53875309c446675af8f09d
Reviewed-on: https://go-review.googlesource.com/c/go/+/658455 Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>