gn: handle continued suffix comments

tools/gn/parser.cc

Index: tools/gn/parser.cc
diff --git a/tools/gn/parser.cc b/tools/gn/parser.cc
index 1eb646394b922aea13c7de1f9fac39ae4ca47a32..debb51201490be9043e4b11f24a3ec0a827f2d09 100644
--- a/tools/gn/parser.cc
+++ b/tools/gn/parser.cc
@@ -550,7 +550,7 @@ void Parser::AssignComments(ParseNode* file) {
     const Location& start = (*i)->GetRange().begin();
     while (j < static_cast<int>(line_comment_tokens_.size())) {
       if (start.byte() >= line_comment_tokens_[j].location().byte()) {
-        const_cast<ParseNode*>((*i))->comments_mutable()->append_before(
+        const_cast<ParseNode*>(*i)->comments_mutable()->append_before(
             line_comment_tokens_[j]);
         ++j;
       } else {
@@ -588,12 +588,16 @@ void Parser::AssignComments(ParseNode* file) {
 
     while (j >= 0) {
       if (end.byte() <= suffix_comment_tokens_[j].location().byte()) {
-        const_cast<ParseNode*>((*i))->comments_mutable()->append_suffix(
+        const_cast<ParseNode*>(*i)->comments_mutable()->append_suffix(
             suffix_comment_tokens_[j]);
         --j;
       } else {
         break;
       }
     }
+
+    // Suffix comments were assigned in reverse, so if there were multiple on
+    // the same node, they need to be reversed.
+    const_cast<ParseNode*>(*i)->comments_mutable()->ReverseSuffix();
   }
 }