Auto merge of #7897 - camsteffen:in-macro, r=flip1995

Replace `in_macro` usage with `from_expansion`

changelog: none

Generally replace `in_macro(span)` with `span.from_expansion()`. If we're just trying to avoid expanded code, this seems more appropriate because any kind of expanded code is prone to false positives. One place I did not touch is `macro_use.rs`. I think this lint could use a rewrite so I moved `in_macro` there, the only place it is still used.

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