eliminate cross-TU calls to rb_vm_empty_cc() #980

Job	Run time
omnibus compilations, source	1m 3s
omnibus compilations, #08	16m 41s
omnibus compilations, #16	17m 51s
omnibus compilations, #14	9m 16s
omnibus compilations, #05	14m 7s
omnibus compilations, #06	15m 19s
omnibus compilations, #17	12m 35s
omnibus compilations, #18	10m 27s
omnibus compilations, #09	16m 58s
omnibus compilations, #04	18m 38s
omnibus compilations, #01	12m 50s
omnibus compilations, #03	13m 37s
omnibus compilations, #11	10m 9s
omnibus compilations, #02	19m 0s
omnibus compilations, #10	16m 3s
omnibus compilations, #12	15m 29s
omnibus compilations, #15	11m 46s
omnibus compilations, #20	9m 51s
omnibus compilations, #19	12m 16s
omnibus compilations, #07	14m 0s
omnibus compilations, #22	11m 31s
omnibus compilations, #13	14m 42s
omnibus compilations, #21	12m 17s
omnibus compilations, #23	10m 13s
omnibus compilations, #24	8m 22s
omnibus compilations, result	8s
	5h 25m 9s

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