maps,runtime: improve maps.Keys
name old time/op new time/op delta
Keys-10 8.65ms ± 0% 7.06ms ± 0% -18.41% (p=0.000 n=9+9)
name old alloc/op new alloc/op delta
Keys-10 58.2kB ± 1% 47.4kB ± 2% -18.54% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
Keys-10 0.00 0.00 ~ (all equal)
Change-Id: Ia7061c37be89e906e79bc3ef3bb1ef0d7913f9f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/481435
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: xie cui <
523516579@qq.com>