docs: add Rust logo to more compiler crates

c6e6ecb added it to some of the
compiler's crates, but avoided adding it to all of them to reduce
bit-rot. This commit adds to more.

Author: notriddle

src/lib.rs

@@ -12,6 +12,8 @@
  * TODO(antoyo): remove the patches.
  */
 
+#![cfg_attr(not(bootstrap), doc(rust_logo))]
+#![cfg_attr(not(bootstrap), feature(rustdoc_internals))]
 #![feature(
     rustc_private,
     decl_macro,