Rollup merge of #98854 - kadiwa4:rustc_hir_pretty_clean_up_borrowing, r=oli-obk
clean up the borrowing in rustc_hir_pretty A whole lot of the `&`s and `ref`s were redundant. I hope doing this in one big commit is fine, because all of the changes are pretty self-contained. `@rustbot` label: +C-cleanup
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