Moves assert_gas() into a define it should always have been, speeding up atmos slightly

code/modules/atmospherics/machinery/portable/canister.dm

@@ -174,7 +174,7 @@
 
 /obj/machinery/portable_atmospherics/canister/proc/create_gas()
 	if(gas_type)
-		air_contents.add_gas(gas_type)
+		ADD_GAS(gas_type, air_contents.gases)
 		if(starter_temp)
 			air_contents.temperature = starter_temp
 		air_contents.gases[gas_type][MOLES] = (maximum_pressure * filled) * air_contents.volume / (R_IDEAL_GAS_EQUATION * air_contents.temperature)

code/modules/atmospherics/machinery/portable/scrubber.dm

@@ -45,7 +45,7 @@
 
 	filtered.temperature = filtering.temperature
 	for(var/gas in filtering.gases & scrubbing)
-		filtered.add_gas(gas)
+		ADD_GAS(gas, filtered.gases)
 		filtered.gases[gas][MOLES] = filtering.gases[gas][MOLES] // Shuffle the "bad" gasses to the filtered mixture.
 		filtering.gases[gas][MOLES] = 0
 	filtering.garbage_collect() // Now that the gasses are set to 0, clean up the mixture.