Dir.each_child: also yield the child `stat` #5846

Job	Run time
omnibus compilations, trigger	2s
omnibus compilations, #8	29m 44s
omnibus compilations, #2	38m 3s
omnibus compilations, #5	25m 31s
omnibus compilations, #3	35m 50s
omnibus compilations, #10	30m 6s
omnibus compilations, #1	28m 56s
omnibus compilations, #7	36m 27s
omnibus compilations, #6	30m 10s
omnibus compilations, #12	15m 48s
omnibus compilations, #4	26m 1s
omnibus compilations, #11	25m 34s
omnibus compilations, #9	29m 45s
omnibus compilations, result	6s
	5h 52m 3s

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