rustdoc: Add Layout::is_uninhabited and use Layout fns

Author: workingjubilee

compiler/rustc_abi/src/lib.rs

@@ -1666,6 +1666,11 @@ impl<FieldIdx: Idx, VariantIdx: Idx> LayoutS<FieldIdx, VariantIdx> {
         }
     }
 
+    /// Returns `true` if this is sized
+    pub fn is_uninhabited(&self) -> bool {
+        self.ir_form.is_uninhabited()
+    }
+
     pub fn scalar<C: HasDataLayout>(cx: &C, scalar: Scalar) -> Self {
         let largest_niche = Niche::from_scalar(cx, Size::ZERO, scalar);
         let size = scalar.size(cx);

src/librustdoc/html/render/type_layout.rs

@@ -60,8 +60,8 @@ pub(crate) fn document_type_layout<'a, 'cx: 'a>(
                         span_bug!(tcx.def_span(ty_def_id), "not an adt")
                     };
                     let name = adt.variant(variant_idx).name;
-                    let is_unsized = variant_layout.abi.is_unsized();
-                    let is_uninhabited = variant_layout.abi.is_uninhabited();
+                    let is_unsized = variant_layout.is_unsized();
+                    let is_uninhabited = variant_layout.is_uninhabited();
                     let size = variant_layout.size.bytes() - tag_size;
                     let type_layout_size = TypeLayoutSize { is_unsized, is_uninhabited, size };
                     (name, type_layout_size)
@@ -72,8 +72,8 @@ pub(crate) fn document_type_layout<'a, 'cx: 'a>(
         };
 
         let type_layout_size = tcx.layout_of(param_env.and(ty)).map(|layout| {
-            let is_unsized = layout.abi.is_unsized();
-            let is_uninhabited = layout.abi.is_uninhabited();
+            let is_unsized = layout.ir_form.is_unsized();
+            let is_uninhabited = layout.ir_form.is_uninhabited();
             let size = layout.size.bytes();
             TypeLayoutSize { is_unsized, is_uninhabited, size }
         });