[rtl] refactor mask unit. #707

Job	Run time
Generate CI target for RTL elaborate	5s
Test elaborate (blastoise)	6s
Test elaborate (physical_design_case_0)	6s
Test elaborate (physical_design_case_1)	6s
Test elaborate (physical_design_case_10)	6s
Test elaborate (physical_design_case_11)	6s
Test elaborate (physical_design_case_12)	5s
Test elaborate (physical_design_case_13)	6s
Test elaborate (physical_design_case_14)	5s
Test elaborate (physical_design_case_15)	6s
Test elaborate (physical_design_case_16)	6s
Test elaborate (physical_design_case_17)	6s
Test elaborate (physical_design_case_18)	7s
Test elaborate (physical_design_case_19)	7s
Test elaborate (physical_design_case_2)	6s
Test elaborate (physical_design_case_20)	5s
Test elaborate (physical_design_case_21)	6s
Test elaborate (physical_design_case_22)	6s
Test elaborate (physical_design_case_23)	5s
Test elaborate (physical_design_case_24)	6s
Test elaborate (physical_design_case_25)	5s
Test elaborate (physical_design_case_26)	5s
Test elaborate (physical_design_case_27)	5s
Test elaborate (physical_design_case_28)	5s
Test elaborate (physical_design_case_3)	6s
Test elaborate (physical_design_case_4)	6s
Test elaborate (physical_design_case_5)	6s
Test elaborate (physical_design_case_6)	7s
Test elaborate (physical_design_case_7)	6s
Test elaborate (physical_design_case_8)	6s
Test elaborate (physical_design_case_9)	6s
Test elaborate (rookidee)	5s
Request physical design report	0s
	3m 5s

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