Bump recursion_limit in a few places

This is needed to get rustdoc to succeed on `dist-x86_64-linux-alt`

compiler/rustc_builtin_macros/src/lib.rs

@@ -11,6 +11,7 @@
 #![feature(or_patterns)]
 #![feature(proc_macro_internals)]
 #![feature(proc_macro_quote)]
+#![recursion_limit = "256"]
 
 extern crate proc_macro;