[Bug dyninst/24884] stapdyn crashes with a segmentation fault

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24884

--- Comment #7 from Frank Ch. Eigler <fche at redhat dot com> ---
(In reply to Avi Kivity from comment #6)
> And the cause for the slowness is lock contention. With only two threads.
> Please please please add thread-local storage to the language.

It's more of a runtime issue than a language issue, but yeah.  Surely there are
some optimization opportunities in what we emit for:

    probe process.mark("reactor_run_tasks_single_start") {
        ++hist[tid(), $arg1]
    }

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