Simplify subclasses list, remove from Box #12637

Job	Run time
omnibus compilations, trigger	3s
omnibus compilations, #5	29m 14s
omnibus compilations, #4	29m 52s
omnibus compilations, #2	37m 3s
omnibus compilations, #1	28m 34s
omnibus compilations, #6	24m 17s
omnibus compilations, #11	25m 6s
omnibus compilations, #3	34m 53s
omnibus compilations, #8	29m 5s
omnibus compilations, #12	14m 54s
omnibus compilations, #10	24m 20s
omnibus compilations, #9	29m 32s
omnibus compilations, #7	35m 23s
omnibus compilations, result	6s
	5h 42m 22s

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