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Auto merge of #151015 - JonathanBrouwer:fix-cratelevel-perf, r=jdonszelmann
Fix perf of `check_crate_level` refactor
Fixes the perf of https://github.com/rust-lang/rust/pull/150930
The problem is that `allowed_targets` allocates a `Vec`
(also moves a comment around to a move useful place)
r? @jdonszelmann
