rustc_hir_id: Add a comment explaining why the crate exists
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//! Library containing Id types from `rustc_hir`, split out so crates can use it without depending
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//! on all of `rustc_hir` (which is large and depends on other large things like `rustc_target`).
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#![allow(internal_features)]
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#![feature(negative_impls)]
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#![feature(rustc_attrs)]
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