hash/maphash: hash channels in purego version of maphash.Comparable
This change makes purego implementation of maphash.Comparable consistent
with the one in runtime and fixes hashing of channels.
Fixes #73657
Change-Id: If78a21d996f0c20c0224d4014e4a4177b09c3aa3
GitHub-Last-Rev:
2537216a1e4e62791c7e417441ee770ca149f38a
GitHub-Pull-Request: golang/go#73660
Reviewed-on: https://go-review.googlesource.com/c/go/+/671655
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: qiu laidongfeng2 <2645477756@qq.com>