More efficient identity and multiplier weight to fee (#11226)

substrate/frame/support/src/weights.rs

@@ -710,6 +710,10 @@ where
 			degree: 1,
 		})
 	}
+
+	fn calc(weight: &Weight) -> Self::Balance {
+		Self::Balance::saturated_from(*weight)
+	}
 }
 
 /// Implementor of [`WeightToFeePolynomial`] that uses a constant multiplier.
@@ -738,6 +742,10 @@ where
 			degree: 1,
 		})
 	}
+
+	fn calc(weight: &Weight) -> Self::Balance {
+		Self::Balance::saturated_from(*weight).saturating_mul(M::get())
+	}
 }
 
 /// A struct holding value for each `DispatchClass`.