Auto merge of #102051 - pietroalbini:pa-bootstrap-update, r=Mark-Simulacrum

Update bootstrap compiler to 1.65.0

This PR updates the bootstrap compiler to Rust 1.65.0, removing the various `cfg(bootstrap)`s.

r? `@Mark-Simulacrum`

Author: bors

compiler/rustc_ast/src/ast.rs

@@ -3046,7 +3046,6 @@ mod size_asserts {
     static_assert_size!(Block, 48);
     static_assert_size!(Expr, 104);
     static_assert_size!(ExprKind, 72);
-    #[cfg(not(bootstrap))]
     static_assert_size!(Fn, 184);
     static_assert_size!(ForeignItem, 96);
     static_assert_size!(ForeignItemKind, 24);

compiler/rustc_ast/src/lib.rs

@@ -13,9 +13,7 @@
 #![feature(const_default_impls)]
 #![feature(const_trait_impl)]
 #![feature(if_let_guard)]
-#![cfg_attr(bootstrap, feature(label_break_value))]
 #![feature(let_chains)]
-#![cfg_attr(bootstrap, feature(let_else))]
 #![feature(min_specialization)]
 #![feature(negative_impls)]
 #![feature(slice_internals)]