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This reverts commit 87e930f7289136fad1310d4b63dd4127e409bac5 (CL 585639) Reason for revert: This is part of a patch series that changed the handling of contended lock2/unlock2 calls, reducing the maximum throughput of contended runtime.mutex values, and causing a performance regression on applications where that is (or became) the bottleneck. Updates #66999 Updates #67585 Change-Id: I1e286d2a16d16e4af202cd5dc04b2d9c4ee71b32 Reviewed-on: https://go-review.googlesource.com/c/go/+/589097 Reviewed-by: Than McIntosh <thanm@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com> Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com>