[clang] [AST] Iterate redecls starting from the canonical one in getRawCommentsForAnyRedecl() (PR #108475)

[Younan Zhang via cfe-commits]

================
@@ -444,7 +444,7 @@ const RawComment *ASTContext::getRawCommentForAnyRedecl(
     return CommentlessRedeclChains.lookup(CanonicalD);
   }();
 
-  for (const auto Redecl : D->redecls()) {
+  for (const auto Redecl : CanonicalD->redecls()) {
----------------
zyn0217 wrote:

Yup, in fact, I think we're not too confident about how many FunctionDecls 
would be generated during the template parsing e.g. they can be the byproducts 
of a TreeTransform/the process of the template argument deduction, such that 
the contract of `TemplateParameterListsInfo` would be less reliable.

https://github.com/llvm/llvm-project/pull/108475
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