Add back expr size checks

Author: WaffleLapkin

compiler/rustc_ast/src/ast.rs

@@ -1112,8 +1112,8 @@ pub struct Expr {
 }
 
 // `Expr` is used a lot. Make sure it doesn't unintentionally get bigger.
-//#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-//rustc_data_structures::static_assert_size!(Expr, 104); // FIXME
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+rustc_data_structures::static_assert_size!(Expr, 104);
 
 impl Expr {
     /// Returns `true` if this expression would be valid somewhere that expects a value;

compiler/rustc_hir/src/hir.rs

@@ -3494,7 +3494,7 @@ impl<'hir> Node<'hir> {
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 mod size_asserts {
     rustc_data_structures::static_assert_size!(super::Block<'static>, 48);
-    //rustc_data_structures::static_assert_size!(super::Expr<'static>, 64); // FIXME
+    rustc_data_structures::static_assert_size!(super::Expr<'static>, 56);
     rustc_data_structures::static_assert_size!(super::Pat<'static>, 88);
     rustc_data_structures::static_assert_size!(super::QPath<'static>, 24);
     rustc_data_structures::static_assert_size!(super::Ty<'static>, 72);