Matthias Krüger f3c6955249
Rollup merge of #110276 - nnethercote:rm-BrAnon-Span, r=jackh726
Remove all but one of the spans in `BoundRegionKind::BrAnon`

There are only three places where `BoundRegionKind::BrAnon` uses `Some(span)` instead of `None`. Two of them are easy to remove, which this PR does.

r? ```@jackh726```
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