[clang] [clang-tools-extra] [clang] Implement CWG2398 provisional TTP matching to class templates (PR #94981)

[via cfe-commits]

================
@@ -139,28 +165,63 @@ TemplateName::NameKind TemplateName::getKind() const {
     return AssumedTemplate;
   if (uncommon->getAsSubstTemplateTemplateParm())
     return SubstTemplateTemplateParm;
+  if (uncommon->getAsDeducedTemplateName())
+    return DeducedTemplate;
+
+  assert(uncommon->getAsSubstTemplateTemplateParmPack() != nullptr);
   return SubstTemplateTemplateParmPack;
 }
 
-TemplateDecl *TemplateName::getAsTemplateDecl() const {
-  if (Decl *TemplateOrUsing = Storage.dyn_cast<Decl *>()) {
-    if (UsingShadowDecl *USD = dyn_cast<UsingShadowDecl>(TemplateOrUsing))
-      return cast<TemplateDecl>(USD->getTargetDecl());
-
-    assert(isa<TemplateDecl>(TemplateOrUsing));
-    return cast<TemplateDecl>(TemplateOrUsing);
-  }
+TemplateDecl *TemplateName::getAsTemplateDecl(bool IgnoreDeduced) const {
----------------
cor3ntin wrote:

That change looks sort of unrelated?

https://github.com/llvm/llvm-project/pull/94981