[mlir][nfc] Fix syntax to conform with the C++20 restrictions on error-prone redundancy

[schweitz]

Summary

See: http://eel.is/c++draft/diff.cpp17.class#2

[schweitz]

Looks like a flang test failed. Is flang broken?

mlir/include/mlir/Dialect/Bufferization/IR/BufferizableOpInterface.h

struct AliasingOpResult {
   OpResult opResult;
   BufferRelation relation;
   bool isDefinite;
 };
 
 template <typename T> class AliasList {
 public:
   /// Create an empty list of aliases.
-  AliasList<T>() = default;
+  AliasList() = default;
 
   /// Create a list of aliases.
-  AliasList<T>(std::initializer_list<T> elems) {
+  AliasList(std::initializer_list<T> elems) {
     for (T alias : elems)
       addAlias(alias);
   }
 
   /// Create a list of aliases.
-  AliasList<T>(SmallVector<T> &&aliases) : aliases(std::move(aliases)) {}
+  AliasList(SmallVector<T> &&aliases) : aliases(std::move(aliases)) {}
 
   ArrayRef<T> getAliases() const { return aliases; }
 
   size_t getNumAliases() const { return aliases.size(); }
 
   void addAlias(T alias) { aliases.push_back(alias); }
 
   auto begin() const { return aliases.begin(); }