Track diagnostic attributes pre proc macro expansion, prepend post expansion. #145914
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A fix for rust-lang/rust-clippy#13521.
Leaving as draft for now.
The first two commits are for a different clippy issue. That fix is a prereq for this, because it ensures that this particular clippy lint is emitted at the correct hir id.
Small repro: https://github.com/2asoft/clippy_13521_repro