[Bug bpf/27877] New: Missing -t timing stats support in the bpf backend

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

https://sourceware.org/bugzilla/show_bug.cgi?id=27877

            Bug ID: 27877
           Summary: Missing -t timing stats support in the bpf backend
           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: ---

Currently the bpf backend lacks probe timing stats enabled by the `-t` CLI
option, as evidenced by the following example:

```
$ /opt/stap/bin/stap -t --bpf -e 'probe oneshot { println("Hello world") }'
Hello world
```

For comparison, the default kernel backend runs fine:

```
$ /opt/stap/bin/stap -t -e 'probe oneshot { println("Hello world") }'
Hello world
----- probe hit report:
begin, (<input>:1:7), hits: 1, cycles: 2880min/2880avg/2880max, variance: 0,
from: oneshot from: oneshot, index: 0
----- refresh report:
```

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