Revert "runtime: profile mutex contention during unlock"
This reverts commit
ba1c5b2c4573e10f3b5f0e0f25a27f17fba67eb0 (CL 585638).
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: Ibeec5d8deb17e87966cf352fefc7efe2267839d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/589115
Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>