[Bug translator/16019] limit number of similar semantic errors output

["jlebon at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16019

--- Comment #5 from Jonathan Lebon <jlebon at redhat dot com> ---
Hi Siarhei,

You have an interesting solution. This works in the case of missing debuginfo,
but I'm not sure if it would be a good match for all situations. It seems like
the logic is something like 'print the chain iff the bottom of the chain is
unique'. We're not necessarily looking for string uniqueness, but rather allow
for some discrepancies.

I tried my hand at this as well. I went the explicit-tagging-in-new-fields way
mentioned in comment 2. It's an 'opt-in' feature which for now only debuginfo
uses. But if we find other areas of the codebase that can produce a lot of
errors we want to shut up, we just have to pass an error type.

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