[TableGen] Use LessRecord() for the sort in getAllDerivedDefinitions instead of re-implementing it. NFC

Author: topperc

llvm/lib/TableGen/Record.cpp

@@ -3251,9 +3251,7 @@ std::vector<Record *> RecordKeeper::getAllDerivedDefinitions(
       Defs.push_back(OneDef.second.get());
   }
 
-  llvm::sort(Defs, [](Record *LHS, Record *RHS) {
-    return LHS->getName().compare_numeric(RHS->getName()) < 0;
-  });
+  llvm::sort(Defs, LessRecord());
 
   return Defs;
 }