Using Once.Do is now extremely cheap because the fast path is just an inlined
atomic load of a variable that is written only once and a conditional jump.
This is very beneficial for Once.Do because, due to its nature, the fast path
will be used for every call after the first one.

In a attempt to mimize code size increase, reorder the fields so that the
pointer to Once is also the pointer to Once.done, that is the only field used
in the hot path. This allows to use more compact instruction encodings or less
instructions in the hot path (that is inlined at every callsite).

name     old time/op  new time/op  delta
Once     4.54ns ± 0%  2.06ns ± 0%  -54.59%  (p=0.000 n=19+16)
Once-4   1.18ns ± 0%  0.55ns ± 0%  -53.39%  (p=0.000 n=15+16)
Once-16  0.53ns ± 0%  0.17ns ± 0%  -67.92%  (p=0.000 n=18+17)

linux/amd64 bin/go 14675861 (previous commit 14663387, +12474/+0.09%)

Change-Id: Ie2708103ab473787875d66746d2f20f1d90a6916
Reviewed-on: https://go-review.googlesource.com/c/go/+/152697
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Austin Clements <austin@google.com>