Fix bignum power_cache across Ractors (used by big2str/str2big) #877

Job	Run time
omnibus compilations, trigger	3s
omnibus compilations, #4	33m 18s
omnibus compilations, #3	33m 47s
omnibus compilations, #9	31m 24s
omnibus compilations, #10	28m 5s
omnibus compilations, #1	19m 9s
omnibus compilations, #7	24m 45s
omnibus compilations, #11	27m 6s
omnibus compilations, #8	29m 46s
omnibus compilations, #12	31m 43s
omnibus compilations, #2	40m 35s
omnibus compilations, #6	34m 23s
omnibus compilations, #5	31m 27s
omnibus compilations, result	7s
	6h 5m 38s

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