Use `-march` correctly (#2302) #2259

Job	Run time
Sanitize (Sanitize, address, ON)	24m 2s
Sanitize (Sanitize, address, OFF)	11m 12s
Sanitize (Sanitize, undefined, ON)	16m 28s
Sanitize (Sanitize, undefined, OFF)	12m 42s
Sanitize (Sanitize, thread, ON)	29m 41s
Sanitize (Sanitize, thread, OFF)	20m 5s
	1h 54m 10s

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