cmd/dist: eliminate "time" special case
The registerTest function has a special case for commands that start
with "time", but we don't use this case anywhere. Delete this special
case and its support code.
Preparation for #37486.
Change-Id: Ica180417e7aa4e4fc260cb97467942bae972fdb6
Reviewed-on: https://go-review.googlesource.com/c/go/+/448801
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>