msp430: fix dadd operation and types for .b instructions #61

Job	Run time
ci / Build	3m 35s
ci / Lint	59s
ci / Test (0)	1m 24s
ci / Test (1)	1m 13s
ci / Test (2)	1m 15s
ci / Test (3)	1m 24s
ci / Test (4)	5m 2s
ci / Test (5)	4m 35s
ci / Test (6)	53s
ci / Test (7)	55s
ci / Test (8)	1m 1s
ci / Test (9)	1m 42s
ci / Publish Unit Tests Results	1s
	23m 59s

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