[Bug tapsets/18649] int_arg() misbehaves on x86[_64] for 32-bit uprobe in binary having debuginfo

[jistone at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18649

--- Comment #5 from Josh Stone <jistone at redhat dot com> ---
(In reply to Martin Cermak from comment #3)
> Maybe it'd be useful to have an option to foce stap not to use debuginfo
> even if it's available. It'd be easier to use and less invasive than strip.
> [...] I see e.g. -P in the man page, but not resp. opposite switch.

I could see this as a tri-state long option, something like:

 --prologue-searching=always (same as -P)
 --prologue-searching=auto (current default, only userspace w/
has_valid_locs())
 --prologue-searching=never (completely disabled)

Ignoring debuginfo for "all" purposes could be a separate option, only
tangentially related to prologues.  We'd still need some debuginfo use to leak
through though -- e.g. we generate debuginfo objects to gather tracepoints. 
Also @cast requires debuginfo, and generated @cast-with-headers is particularly
useful to otherwise "dwarfless" probing.

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