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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Dylan DPC 2022-07-05 10:42:58 +05:30 committed by GitHub
commit 6e5f1d491a
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