This reverts CL 166985, restoring CL 162698.

The bootstrap failure from CL 162698 was fixed in
CL 167077 and CL 167078.

Fixes #30228

Change-Id: I5a4e3081018c51b74b67185e64f20a9c824a564e
Reviewed-on: https://go-review.googlesource.com/c/go/+/167087
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>