[Bug default/24766] [Regression] dwz exits with 1 when running into ".debug_info section not present" error

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24766

--- Comment #13 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #12)
> And then the question is what happens if there are multiple issues (or
> harmless warnings) reported, what the final error code should be.  Say -m,
> one file has no .debug_info, another one where no compression is beneficial,
> another one has corrupt .debug_info, etc.

I suppose you could classify the exit status in increasing level of severity,
and return the maximum severity.

Something like:
- 0: valid input, compressed
- 1: valid input, not compressed
- 2: invalid input, compressed
- 3: invalid input, not compressed
[ Though I'm not sure about the relative order of 1 and 2 ]

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