================
@@ -3128,6 +3128,26 @@ bool Type::isStdByteType() const {
   return false;
 }
 
+static const TemplateDecl *getSpecializedTemplateType(const Type *T) {
+  const Type *DesugaredType = T->getUnqualifiedDesugaredType();
+  if (const auto *Specialization =
+          DesugaredType->getAs<TemplateSpecializationType>())
+    return Specialization->getTemplateName().getAsTemplateDecl();
+  if (const auto *Record = DesugaredType->getAsCXXRecordDecl()) {
+    if (const auto *CTS = dyn_cast<ClassTemplateSpecializationDecl>(Record))
+      return CTS->getSpecializedTemplate();
+  }
+  return nullptr;
+}
+
----------------
ojhunt wrote:

As we've removed this logic entirely now I've reverted the addition of the 
method

https://github.com/llvm/llvm-project/pull/113510
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