Auto merge of #16358 - krobelus:fix-redundant-references-with-macros, r=Veykril

Deduplicate references when some of them are in macro expansions

EDIT: I wonder if this is a regression, I'll try to investigate.

Commit 6a06f6f72 (Deduplicate reference search results, 2022-11-07)
deduplicates references within each definition.

Apparently our descend_into_macros() stanza returns
one definition for each time a name is used in a macro.
Each of those definitions has the same set of references.
We return them all, leading to many redundant references.

Work around this by deduplicating definitions as well.  Perhaps there
is a better fix to not produce duplicate definitions in the first
place.

I discovered this working with the "bitflags" macro from the crate
of the same name.

Fixes #16357

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