Revert "runtime: double-link list of waiting Ms"
This reverts commit
d881ed6384ae58154d99682f1e20160c64e7c3c2 (CL 585637).
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: I70d8d0b74f73be95c43d664f584e8d98519aba26
Reviewed-on: https://go-review.googlesource.com/c/go/+/589116
Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>