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Unshare arrays only when they become shareable #735

Job	Run time
omnibus compilations, source	1m 25s
omnibus compilations, #05	11m 49s
omnibus compilations, #03	12m 46s
omnibus compilations, #02	13m 0s
omnibus compilations, #16	9m 15s
omnibus compilations, #14	8m 31s
omnibus compilations, #12	10m 28s
omnibus compilations, #11	10m 26s
omnibus compilations, #07	11m 55s
omnibus compilations, #18	8m 38s
omnibus compilations, #08	10m 29s
omnibus compilations, #13	10m 12s
omnibus compilations, #22	7m 53s
omnibus compilations, #04	11m 11s
omnibus compilations, #10	10m 19s
omnibus compilations, #17	8m 55s
omnibus compilations, #21	9m 12s
omnibus compilations, #01	10m 26s
omnibus compilations, #09	10m 17s
omnibus compilations, #20	8m 23s
omnibus compilations, #19	8m 41s
omnibus compilations, #15	8m 4s
omnibus compilations, #06	10m 29s
omnibus compilations, #23	6m 48s
omnibus compilations, #24	5m 42s
omnibus compilations, result	11s
	3h 55m 25s