Auto merge of rust-lang#134376 - jdonszelmann:fix-rustdoc-perf, r=jieyouxu

Try to fix perf regression in rustdoc after hir attributes

Slight performance regression introduced in rust-lang#131808

r? `@jieyouxu`

Author: bors

compiler/rustc_resolve/src/rustdoc.rs

@@ -12,6 +12,7 @@ use rustc_middle::ty::TyCtxt;
 use rustc_span::def_id::DefId;
 use rustc_span::symbol::{Symbol, kw, sym};
 use rustc_span::{DUMMY_SP, InnerSpan, Span};
+use thin_vec::ThinVec;
 use tracing::{debug, trace};
 
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
@@ -196,9 +197,9 @@ pub fn add_doc_fragment(out: &mut String, frag: &DocFragment) {
 pub fn attrs_to_doc_fragments<'a, A: AttributeExt + Clone + 'a>(
     attrs: impl Iterator<Item = (&'a A, Option<DefId>)>,
     doc_only: bool,
-) -> (Vec<DocFragment>, Vec<A>) {
+) -> (Vec<DocFragment>, ThinVec<A>) {
     let mut doc_fragments = Vec::new();
-    let mut other_attrs = Vec::<A>::new();
+    let mut other_attrs = ThinVec::<A>::new();
     for (attr, item_id) in attrs {
         if let Some((doc_str, comment_kind)) = attr.doc_str_and_comment_kind() {
             let doc = beautify_doc_string(doc_str, comment_kind);

src/librustdoc/clean/types.rs

@@ -1150,7 +1150,7 @@ pub struct RenderedLink {
 #[derive(Clone, Debug, Default)]
 pub(crate) struct Attributes {
     pub(crate) doc_strings: Vec<DocFragment>,
-    pub(crate) other_attrs: Vec<hir::Attribute>,
+    pub(crate) other_attrs: ThinVec<hir::Attribute>,
 }
 
 impl Attributes {