Well, if you need it fast, this seems faster than golang:

$ # note, run it once before timing it...inline::c will cache the created code
$ time perl x.pl
0       999837
1       999643
2       998992
3       999381
4       1000629
5       999501
6       999830
7       1001287
8       1001751
9       999149

real    0m0.129s
user    0m0.124s
sys     0m0.004s

I'm "cheating" though:

#!/usr/bin/perl
use Inline C;
use strict;
use warnings;

my $count=doit(10_000_000);
for my $int ( sort keys %{$count} ) {
    printf "%s\t%s\n", $int,$$count{$int};
}

__END__
__C__
#include <string.h>
SV* doit(int howmany) {
    HV* hv=newHV();
    unsigned int count[10]={0};
    time_t t;
    char key[2];

    srand((unsigned) time(&t));
    for (int i=0;i<howmany;i++) {
        count[rand()%10]++;
    }
    for (int i=0;i < 10;i++) {
       sprintf(key,"%d",i);
       hv_store(hv,key,1,newSVuv(count[i]),0);
    }
    return newRV_noinc((SV *)hv);
}
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