Shorten some dependency chains in the compiler#145390

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joshtriplett wants to merge 7 commits intorust-lang:masterfrom

joshtriplett:rustc-diag-value-earlier

Commits on Aug 16, 2025

Move `IntoDiagArg` earlier in the dependency chains
joshtriplett
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Split `rustc_hir_id` out of `rustc_hir`
joshtriplett
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Update test output for change to number of crates
joshtriplett
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rustc_lint_defs: Use `DefPathHash` from `rustc_span` rather than `rustc_hir`
joshtriplett
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rustc_lint_defs: Eliminate the dependency on `rustc_hir` for `Namespace`
joshtriplett
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Eliminate unnecessary dependency from `rustc_mir_dataflow` to `rustc_hir`
joshtriplett
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Eliminate unnecessary dependency from `rustc_traits` to `rustc_hir`
joshtriplett
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