TargetSelectionDAG: Add missing atomic fp opd classes (#102269)

The defs are missing after 5c9352e .

Author: jsji

llvm/include/llvm/Target/TargetSelectionDAG.td

@@ -1748,6 +1748,8 @@ multiclass binary_atomic_op_fp<SDNode atomic_op> {
       let IsAtomic = true;
       let MemoryVT = vt;
     }
+
+    defm NAME#_#vt : binary_atomic_op_ord;
   }
 }