[Bug 268944] pmcstat -p on arm64 spews spaces to stdout

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268944

            Bug ID: 268944
           Summary: pmcstat -p on arm64 spews spaces to stdout
           Product: Base System
           Version: 13.1-STABLE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: jfc@mit.edu

On an Ampere eMAG system pmcstat spews millions of spaces to stdout even when
it traces a short-running program.

$ pmcstat -p instructions ls > /dev/null 2> /tmp/pmc.out
$ od -x /tmp/pmc.out
0000000      2023    2020    2020    2020    2020    2020    2020    2020
0000020      2020    2020    2020    2020    2020    2020    2020    2020
*
1073037460      2020    2020    7020    692f    736e    7274    6375    6974
1073037500      6e6f    2073    200a    2020    2020    2020    2020    2020
1073037520      2020    2020    2020    2020    2020    2020    2020    2020
*
2166077200      3420    3830    3236    3731    0a20                        
2166077212
$ ls -ld /tmp/pmc.out
-rw-r--r--  1 jfc  wheel  299400842 Jan 13 19:09 /tmp/pmc.out
$ uname -a
FreeBSD marmota 13.1-STABLE FreeBSD 13.1-STABLE #44
marmota-n253284-e10da2da2ae9: Tue Dec 13 20:59:21 EST 2022    
root@marmota:/usr/obj/usr/src/arm64.aarch64/sys/MARMOTA arm64

My test was in /usr/src and ls produced 33 lines of output.  In an empty
directory ls completes before pmcstat can go crazy.

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