Revert "Revert legacy"

This reverts commit 4f12659.

Author: CPunisher

crates/swc_ecma_lexer/src/lexer/comments_buffer.rs

@@ -25,10 +25,6 @@ impl CommentsBuffer {
             pending_leading: OneDirectionalList::new(),
         }
     }
-
-    pub fn take_pending_leading(&mut self) -> Rev<IntoIter<Comment>> {
-        self.pending_leading.take_all()
-    }
 }
 
 impl CommentsBufferTrait for CommentsBuffer {

crates/swc_ecma_lexer/src/lexer/state.rs

@@ -11,7 +11,7 @@ use crate::{
         input::Tokens,
         lexer::{
             char::CharExt,
-            comments_buffer::{BufferedComment, BufferedCommentKind, CommentsBufferTrait},
+            comments_buffer::{BufferedCommentKind, CommentsBufferTrait},
             state::{
                 State as StateTrait, TokenKind as TokenKindTrait, TokenType as TokenTypeTrait,
             },
@@ -870,13 +870,7 @@ impl Iterator for Lexer<'_> {
         let span = self.span(start);
         if !matches!(token, Token::Eof) {
             if let Some(comments) = self.comments_buffer.as_mut() {
-                for comment in comments.take_pending_leading() {
-                    comments.push_comment(BufferedComment {
-                        kind: BufferedCommentKind::Leading,
-                        pos: start,
-                        comment,
-                    });
-                }
+                comments.pending_to_comment(BufferedCommentKind::Leading, start);
             }
 
             self.state.update(start, token.kind());