Simplify subclasses list, remove from Box #12661

Job	Run time
omnibus compilations, trigger	3s
omnibus compilations, #2	35m 49s
omnibus compilations, #5	27m 29s
omnibus compilations, #9	29m 13s
omnibus compilations, #6	28m 53s
omnibus compilations, #4	26m 34s
omnibus compilations, #11	25m 0s
omnibus compilations, #7	35m 1s
omnibus compilations, #1	28m 27s
omnibus compilations, #8	24m 58s
omnibus compilations, #3	34m 22s
omnibus compilations, #12	16m 29s
omnibus compilations, #10	28m 7s
omnibus compilations, result	4s
	5h 40m 29s

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