[FOLD] fix error in llvm/ADT/ArrayRef.h

Author: sdkrystian

llvm/include/llvm/ADT/ArrayRef.h

@@ -460,8 +460,11 @@ namespace llvm {
 
     OwningArrayRef &operator=(OwningArrayRef &&Other) {
       delete[] this->data();
-      this->MutableArrayRef<T>::operator=(Other);
-      Other.MutableArrayRef<T>::operator=(MutableArrayRef<T>());
+      using Base = MutableArrayRef<T>;
+      // GCC versions prior to 11.1 incorrectly reject if the 'template' keyword
+      // is used prior to the nested-name-specifier here.
+      this->Base::operator=(Other);
+      Other.Base::operator=(Base());
       return *this;
     }