Rollup merge of #120423 - RalfJung:indirect-structural-match, r=petrochenkov

update indirect structural match lints to match RFC and to show up for dependencies

This is a large step towards implementing https://github.com/rust-lang/rfcs/pull/3535.
We currently have five lints related to "the structural match situation":
- nontrivial_structural_match
- indirect_structural_match
- pointer_structural_match
- const_patterns_without_partial_eq
- illegal_floating_point_literal_pattern

This PR concerns the first 3 of them. (The 4th already is set up to show for dependencies, and the 5th is removed by https://github.com/rust-lang/rust/pull/116284.) nontrivial_structural_match is being removed as per the RFC; the other two are enabled to show up in dependencies.

Fixes https://github.com/rust-lang/rust/issues/73448 by removing the affected analysis.

compiler/rustc_middle/src/mir/query.rs

@@ -189,7 +189,7 @@ pub struct BorrowCheckResult<'tcx> {
 
 /// The result of the `mir_const_qualif` query.
 ///
-/// Each field (except `error_occurred`) corresponds to an implementer of the `Qualif` trait in
+/// Each field (except `tainted_by_errors`) corresponds to an implementer of the `Qualif` trait in
 /// `rustc_const_eval/src/transform/check_consts/qualifs.rs`. See that file for more information on each
 /// `Qualif`.
 #[derive(Clone, Copy, Debug, Default, TyEncodable, TyDecodable, HashStable)]
@@ -197,7 +197,6 @@ pub struct ConstQualifs {
     pub has_mut_interior: bool,
     pub needs_drop: bool,
     pub needs_non_const_drop: bool,
-    pub custom_eq: bool,
     pub tainted_by_errors: Option<ErrorGuaranteed>,
 }