[Bug translator/14924] warn on complex $ptr->foo expressions in .return probes

[jistone at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14924

--- Comment #5 from Josh Stone <jistone at redhat dot com> ---
If you're going to make a broad warning, please do switch the tapsets to share
in the users' pain.  (i.e. don't suppress the warning -- dogfood it)

But again, remember PR18579 that autocast @entry($foo)->bar doesn't work,
whereas it does work with implicit entry-value saving.  Maybe this can be
partially kludged by special-casing @entry on a plain target value.

IIRC, @entry doesn't use kretprobe pouches either, for the similar reason that
the expression type may not be fully known yet.

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