Revert "runtime: profile contended lock calls"

Revert "runtime: profile contended lock calls"

This reverts commit go.dev/cl/528657.

Reason for revert: broke a lot of builders.

Change-Id: I70c33062020e997c4df67b3eaa2e886cf0da961e
Reviewed-on: https://go-review.googlesource.com/c/go/+/543660
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>