Auto merge of #104048 - cjgillot:split-lifetime, r=compiler-errors

Separate lifetime ident from lifetime resolution in HIR

Drive-by: change how suggested generic args are computed.
Fixes https://github.com/rust-lang/rust/issues/103815

I recommend reviewing commit-by-commit.

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -1211,7 +1211,7 @@ fn get_mut_span_in_struct_field<'tcx>(
         && let hir::Node::Field(field) = node
         && let hir::TyKind::Rptr(lt, hir::MutTy { mutbl: hir::Mutability::Not, ty }) = field.ty.kind
     {
-        return Some(lt.span.between(ty.span));
+        return Some(lt.ident.span.between(ty.span));
     }
 
     None