Simplify LazyAttrTokenStream.

This commit does the following.
- Changes it from `Lrc<Box<dyn ToAttrTokenStream>>` to
  `Lrc<LazyAttrTokenStreamInner>`.
- Reworks `LazyAttrTokenStreamImpl` as `LazyAttrTokenStreamInner`, which
  is a two-variant enum.
- Removes the `ToAttrTokenStream` trait and the two impls of it.

The recursion limit must be increased in some crates otherwise rustdoc
aborts.

compiler/rustc_parse/src/lib.rs

@@ -11,6 +11,7 @@
 #![feature(if_let_guard)]
 #![feature(iter_intersperse)]
 #![feature(string_from_utf8_lossy_owned)]
+#![recursion_limit = "256"]
 // tidy-alphabetical-end
 
 use std::path::{Path, PathBuf};

compiler/rustc_parse/src/parser/attr_wrapper.rs

@@ -3,8 +3,7 @@ use std::mem;
 
 use rustc_ast::token::Token;
 use rustc_ast::tokenstream::{
-    AttrsTarget, LazyAttrTokenStream, LazyAttrTokenStreamImpl, NodeRange, ParserRange, Spacing,
-    TokenCursor,
+    AttrsTarget, LazyAttrTokenStream, NodeRange, ParserRange, Spacing, TokenCursor,
 };
 use rustc_ast::{self as ast, AttrVec, Attribute, HasAttrs, HasTokens};
 use rustc_data_structures::fx::FxHashSet;
@@ -337,13 +336,13 @@ impl<'a> Parser<'a> {
         //     - `attrs`: includes the outer and the inner attr.
         //     - `tokens`: lazy tokens for `g` (with its inner attr deleted).
 
-        let tokens = LazyAttrTokenStream::new(LazyAttrTokenStreamImpl {
-            start_token: collect_pos.start_token,
-            cursor_snapshot: collect_pos.cursor_snapshot,
+        let tokens = LazyAttrTokenStream::new_pending(
+            collect_pos.start_token,
+            collect_pos.cursor_snapshot,
             num_calls,
-            break_last_token: self.break_last_token,
+            self.break_last_token,
             node_replacements,
-        });
+        );
         let mut tokens_used = false;
 
         // If in "definite capture mode" we need to register a replace range
@@ -405,14 +404,3 @@ fn needs_tokens(attrs: &[ast::Attribute]) -> bool {
         }
     })
 }
-
-// Some types are used a lot. Make sure they don't unintentionally get bigger.
-#[cfg(target_pointer_width = "64")]
-mod size_asserts {
-    use rustc_data_structures::static_assert_size;
-
-    use super::*;
-    // tidy-alphabetical-start
-    static_assert_size!(LazyAttrTokenStreamImpl, 96);
-    // tidy-alphabetical-end
-}