[Bug bpf/27030] New: bpf: user_long_error() leads to assertion failures in the translator

["agentzh at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27030

            Bug ID: 27030
           Summary: bpf: user_long_error() leads to assertion failures in
                    the translator
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bpf
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

I tried using the `user_long_error()` tapset function with the bpf runtime but
it fails with an assertion failure in the translator. Tested the latest master
branch on Fedora 32 x86_64.


```
[agentzh@fed32-min ~/git/systemtap 134 (master)]$ cat a.c
long a = 0xdeadbeef;

int main (void) {
    return 0;
}

[agentzh@fed32-min ~/git/systemtap 0 (master)]$ gcc -g a.c -o /tmp/a.out

[agentzh@fed32-min ~/git/systemtap 0 (master)]$ nm /tmp/a.out|grep ' a'
0000000000404020 D a

[agentzh@fed32-min ~/git/systemtap 0 (master)]$ /opt/stap/bin/stap --bpf -c
./a.out -e 'probe process("/tmp/a.out").function("main") { println("a: ",
user_long_error(0x601020)) exit() }'
stap: staptree.h:1349: virtual update_visitor::~update_visitor(): Assertion
`values.empty()' failed.
Aborted (core dumped)

[agentzh@fed32-min ~/git/systemtap 130 (master)]$ /opt/stap/bin/stap -V
Systemtap translator/driver (version 4.5/0.182, commit
release-4.4-24-g3e0d449fe427 + changes)
Copyright (C) 2005-2020 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
tested kernel versions: 2.6.32 ... 5.10.0-rc
enabled features: BPF NLS
```

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