msp430: fix dadd operation and types for .b instructions (#67) #62

Job	Run time
ci / Build	3m 36s
ci / Lint	55s
ci / Test (0)	1m 20s
ci / Test (1)	1m 16s
ci / Test (2)	1m 22s
ci / Test (3)	1m 1s
ci / Test (4)	2m 28s
ci / Test (5)	58s
ci / Test (6)	1m 18s
ci / Test (7)	1m 33s
ci / Test (8)	1m 0s
ci / Test (9)	1m 46s
ci / Publish Unit Tests Results	1s
	18m 34s

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