Auto merge of #96770 - flip1995:fix-trait-type-in-bounds, r=cjgillot

Track if a where bound comes from a impl Trait desugar

With https://github.com/rust-lang/rust/pull/93803 `impl Trait` function arguments get desugared to hidden where bounds. However, Clippy needs to know if a bound was originally a `impl Trait` or an actual bound. This adds a field to the `WhereBoundPredicate` struct to keep track of this information during AST->HIR lowering.

r? `@cjgillot`

cc `@estebank` (as the reviewer of #93803)

compiler/rustc_ast_lowering/src/lib.rs

@@ -1298,6 +1298,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                             def_node_id,
                             &GenericParamKind::Type { default: None },
                             hir_bounds,
+                            hir::PredicateOrigin::ImplTrait,
                         ) {
                             in_band_ty_bounds.push(preds)
                         }