cmd/compile: intrinsify publicationBarrier

This CL intrinsify asm call for publicationBarrier on ARM64. As for x86
we may completly removes any instructions due to strong memory
oredering, but decided to leave it as is for compiler barrier.

Benchmarks Go1 ARM64:
name                     old time/op    new time/op    delta
BinaryTree17-8              3.38s ± 1%     3.36s ± 1%    ~     (p=0.095 n=5+5)
Fannkuch11-8                2.93s ± 0%     2.84s ± 0%  -3.26%  (p=0.008 n=5+5)
FmtFprintfEmpty-8          54.2ns ± 1%    54.0ns ± 1%    ~     (p=0.690 n=5+5)
FmtFprintfString-8          111ns ± 0%     109ns ± 0%  -1.48%  (p=0.008 n=5+5)
FmtFprintfInt-8             140ns ± 0%     138ns ± 0%  -1.10%  (p=0.000 n=4+5)
FmtFprintfIntInt-8          168ns ± 0%     169ns ± 0%  +0.66%  (p=0.008 n=5+5)
FmtFprintfPrefixedInt-8     206ns ± 1%     195ns ± 0%  -5.12%  (p=0.008 n=5+5)
FmtFprintfFloat-8           270ns ± 0%     269ns ± 0%  -0.20%  (p=0.024 n=5+5)
FmtManyArgs-8               721ns ± 0%     733ns ± 0%  +1.69%  (p=0.008 n=5+5)
GobDecode-8                9.75ms ± 1%    9.28ms ± 3%  -4.88%  (p=0.008 n=5+5)
GobEncode-8                6.38ms ± 1%    6.34ms ± 1%    ~     (p=0.095 n=5+5)
Gzip-8                      255ms ± 0%     254ms ± 0%  -0.44%  (p=0.008 n=5+5)
Gunzip-8                   41.8ms ± 1%    40.8ms ± 0%  -2.40%  (p=0.008 n=5+5)
HTTPClientServer-8         65.1µs ± 1%    65.1µs ± 1%    ~     (p=0.690 n=5+5)
JSONEncode-8               11.7ms ± 0%    11.7ms ± 1%    ~     (p=0.841 n=5+5)
JSONDecode-8               60.2ms ± 1%    60.0ms ± 0%    ~     (p=0.841 n=5+5)
Mandelbrot200-8            5.85ms ± 0%    5.86ms ± 0%  +0.22%  (p=0.016 n=4+5)
GoParse-8                  4.38ms ± 0%    4.35ms ± 0%  -0.60%  (p=0.008 n=5+5)
RegexpMatchEasy0_32-8      87.1ns ± 2%    88.3ns ± 1%    ~     (p=0.151 n=5+5)
RegexpMatchEasy0_1K-8       306ns ± 0%     306ns ± 1%    ~     (p=0.143 n=5+5)
RegexpMatchEasy1_32-8      86.3ns ± 0%    84.8ns ± 0%  -1.81%  (p=0.008 n=5+5)
RegexpMatchEasy1_1K-8       491ns ± 2%     487ns ± 1%    ~     (p=0.548 n=5+5)
RegexpMatchMedium_32-8     7.50ns ± 0%    7.49ns ± 1%    ~     (p=0.817 n=5+5)
RegexpMatchMedium_1K-8     40.3µs ± 1%    39.9µs ± 0%  -1.02%  (p=0.008 n=5+5)
RegexpMatchHard_32-8       2.10µs ± 1%    2.10µs ± 1%    ~     (p=0.548 n=5+5)
RegexpMatchHard_1K-8       62.4µs ± 1%    62.5µs ± 2%    ~     (p=0.690 n=5+5)
Revcomp-8                   504ms ± 1%     502ms ± 1%    ~     (p=0.095 n=5+5)
Template-8                 86.8ms ± 1%    86.5ms ± 1%    ~     (p=0.222 n=5+5)
TimeParse-8                 330ns ± 0%     327ns ± 0%  -0.84%  (p=0.008 n=5+5)
TimeFormat-8                383ns ± 1%     392ns ± 1%  +2.42%  (p=0.008 n=5+5)
[Geo mean]                 54.3µs         53.9µs       -0.67%

name                     old speed      new speed      delta
GobDecode-8              78.7MB/s ± 1%  82.8MB/s ± 4%  +5.16%  (p=0.008 n=5+5)
GobEncode-8               120MB/s ± 1%   121MB/s ± 1%    ~     (p=0.095 n=5+5)
Gzip-8                   76.2MB/s ± 0%  76.5MB/s ± 0%  +0.44%  (p=0.008 n=5+5)
Gunzip-8                  464MB/s ± 1%   475MB/s ± 0%  +2.45%  (p=0.008 n=5+5)
JSONEncode-8              166MB/s ± 0%   166MB/s ± 1%    ~     (p=0.841 n=5+5)
JSONDecode-8             32.2MB/s ± 1%  32.3MB/s ± 0%    ~     (p=0.714 n=5+5)
GoParse-8                13.2MB/s ± 0%  13.3MB/s ± 0%  +0.59%  (p=0.008 n=5+5)
RegexpMatchEasy0_32-8     368MB/s ± 2%   362MB/s ± 1%    ~     (p=0.151 n=5+5)
RegexpMatchEasy0_1K-8    3.34GB/s ± 0%  3.34GB/s ± 1%    ~     (p=0.127 n=5+5)
RegexpMatchEasy1_32-8     371MB/s ± 0%   378MB/s ± 0%  +1.84%  (p=0.008 n=5+5)
RegexpMatchEasy1_1K-8    2.09GB/s ± 2%  2.10GB/s ± 1%    ~     (p=0.548 n=5+5)
RegexpMatchMedium_32-8    133MB/s ± 0%   134MB/s ± 1%    ~     (p=0.952 n=5+5)
RegexpMatchMedium_1K-8   25.4MB/s ± 1%  25.6MB/s ± 0%  +1.04%  (p=0.008 n=5+5)
RegexpMatchHard_32-8     15.3MB/s ± 1%  15.2MB/s ± 1%    ~     (p=0.500 n=5+5)
RegexpMatchHard_1K-8     16.4MB/s ± 1%  16.4MB/s ± 2%    ~     (p=0.595 n=5+5)
Revcomp-8                 504MB/s ± 1%   506MB/s ± 1%    ~     (p=0.095 n=5+5)
Template-8               22.4MB/s ± 1%  22.4MB/s ± 1%    ~     (p=0.206 n=5+5)
[Geo mean]                120MB/s        121MB/s       +0.71%

Change-Id: I9cc10840b5c0d6bf759150f052c79f4c499e35e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/328290
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: David Chase <drchase@google.com>

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